Industries haven’t always relied on sophisticated compounds, but the story of nickel sulfate heptahydrate stretches back to early 19th-century chemistry. Even before modern electronics or rechargeable batteries, workers and chemists spotted its distinct blue-green color in primitive nickel refining. Nobody rushed to perfect the product at first because nickel itself seemed like a minor player until steelmaking and electrical applications exploded. Through those decades, researchers tinkered with hydrating processes, figuring out how to make a consistent, safe product. They found that adding water molecules (heptahydrate) made storage and handling easier, which launched its journey into broader industrial settings.
Nickel sulfate heptahydrate comes with a clear chemical composition: NiSO4·7H2O. Green-blue crystals reveal its presence in the lab. This form holds steady solubility and stands out for its high purity, which industries love for predictable behavior. It carries around 22% nickel by weight, plenty for plating shops and battery makers. The color gives away its hydration level, and nobody finds it hard to differentiate from other nickel salts. Companies stamp out everything from powder to granules, but the crystalline lump dominating the market always draws attention with its signature shade and structure.
Nickel sulfate heptahydrate forms monoclinic, sometimes triclinic, blue-green crystals that bring to mind clear water lakes under a bright sky. It dissolves easily in water, enough that a beaker can turn bright blue with a small scoop. Melting happens at around 53°C, and it leaves behind a sticky slurry if gently warmed, but heat it strongly and the heptahydrate loses its water, turning into the anhydrous salt. The compound breaks down at higher temperatures, releasing sulfur oxides. In air, it clumps quickly from humidity, reminding anyone handling it that it loves moisture. It reacts with bases and carbonate salts, producing nickel carbonate and releasing the sharply-smelling gaseous byproducts typical for such salt–base reactions.
Manufacturers stamp precise labels onto every drum, listing CAS Number 10101-97-0 along with warnings for eye, skin, and respiratory irritation. Product purity often sits above 98%, and labels mark any traces (cobalt, iron, sodium) down to a fraction of a percent. Packaging usually means thick polyethylene bags inside steel drums – a cheap insurance against leaks. Operators get a Material Safety Data Sheet in every shipment, no exceptions, and shipping regulations put the product firmly into hazardous goods status, so every pallet moves with caution. Those details matter, especially for memory or lithium-ion battery makers, where trace impurity can decide the lifespan of a cell.
Turning raw nickel into nickel sulfate heptahydrate takes a blend of chemistry, engineering, and old-fashioned patience. Makers often start with nickel metal or nickel oxides, dissolving it in sulfuric acid. The reaction foams and releases heat unless carefully controlled. Purification follows – say, by filtration or adding more acid to precipitate out annoying contaminants. Crystallization comes from slow cooling or evaporating the solution, letting those blue-green crystals build up, one layer after another. Old refineries sometimes started with sullied ores, requiring heavier upfront purification, but newer plants run cleaner feeds, producing product fit for everything from agriculture to shiny faucet fixtures.
While some nickel compounds just sit there, nickel sulfate heptahydrate does real work. In the lab, it turns into nickel carbonate, hydroxide, or oxalate after a basic solution washes through it, each derivative feeding another step in the value chain. As a precursor, it helps build catalysts in hydrogenation reactions or forms the backbone for newer battery cathodes. Electroplating lines add direct electric current and deposit pure nickel onto steel, copper, or other metals with this sulfate starring in the bath. tweaks—adjusting pH or adding small extra salts—let workers get the precise surface finish their customer demands, whether they want a matte or mirror effect.
Chemists and industry folks often call this chemical Nickel(II) Sulfate Heptahydrate or just nickel sulfate crystals. Trade names may feature ‘nickelous sulfate’ or turn it into marketing shorthand: NSH or NASH. No matter the name, the real-world requirements remain the same — customers expect pure, stable blue crystals. In scientific circles, nobody confuses this for the anhydrous or hexahydrate forms, and supply contracts get very specific on form and purity.
Nobody treats nickel sulfate heptahydrate lightly. The fine powder throws up a dust cloud if dumped too fast, and anyone caught without gloves risks contact dermatitis. Sensitization can creep up over time, even for careful workers. Respirators and proper ventilation cut down airborne hazards in plating shops. Chronic exposure gets more serious: inhaling particulate nickel can trigger asthma and some forms of cancer, so longtime employees need routine checks and rigorous hygiene practices. In storage, strong rules apply for labeling, segregation, and spill response: keep far away from strong reducers, and always clean up spills quickly. These safety protocols don’t just exist to check a box; they build a culture of respect, from drum loader up to plant manager.
The big story over the last decade: batteries. Nickel sulfate heptahydrate sits at the heart of lithium-ion battery cathode mixes, fueling electric vehicles and mass energy storage units. Without this compound, cathode chemistries like NMC and NCA lose capacity fast. Its role in electroplating barely trails behind in scale, lining everything from tools and fasteners to household plumbing fixtures. Some companies add it as a micronutrient for crops—plants need nickel, just like people need zinc. On the research front, scientists chase purer forms to unlock higher battery density or build more robust catalysts for green hydrogen projects, knowing that tomorrow’s sustainable tech depends on today’s rigorous chemistry.
Researchers aim to wring every improvement from nickel sulfate heptahydrate. Work on ultra-high-purity grades takes place in tandem with process engineers finding ways to skip chlorine-based refining, cutting down toxic waste streams. University labs tinker with doping—adding other metals in minute quantities to create supercharged battery materials, hoping for that big breakthrough in lifetime and charge rate. Newer crystallization technologies—membrane filtration or novel solvents—get trialed to lower water use. Some groups have looked at recycling routes, especially as spent batteries pile up; they dissolve old cathodes and recover nickel sulfate for another production round. Every step shifts the boundaries of what this standard salt can do, and every new finding goes right back into commercial production or pilot plants.
Long-term studies agree: nickel sulfate heptahydrate poses a health risk, with Europe classifying it as carcinogenic through inhalation. Lab tests on rodents echo what industrial hygienists see in humans—respiratory problems, skin reactions, and, over a working lifetime, higher cancer risk. Agencies set strict air exposure limits, and water standards require special treatment for nickel-laced effluent. Operators need personal protective equipment, and companies monitor air and water daily. Medical surveillance programs keep track of worker exposures, stepping in before chronic symptoms develop. The compound’s danger sharpens as industries push for higher throughputs, more so in countries with less robust safety enforcement.
With clean energy targets tightening, demand for high-quality nickel sulfate heptahydrate continues upward. Automotive and stationary battery factories crave supply, pushing producers to scale up and lower environmental impact. Green chemistry efforts pick up steam, aiming for closed-loop, zero-waste processes. Battery recyclers move front and center, extracting nickel sulfate from old packs and closing the raw material loop. Simultaneously, researchers explore cheaper hydrometallurgical methods and renew their focus on health and environmental controls. Global competition nudges suppliers toward better product traceability and purity while, in the background, regulatory frameworks tighten to protect workers and communities from legacy and emerging risks. I’ve seen firsthand how companies collaborate—sharing data and refining best practices—knowing that success rides not only on having enough material but on doing the job right for people and the planet.
Nickel sulfate heptahydrate plays a key role in powering our phones, tablets, and electric vehicles. The appetite for rechargeable batteries keeps soaring as more people look at cleaner ways to get around and stay connected. Nickel, stored in this chemical form, feeds into battery cathodes. Cathodes mean more energy packed in smaller spaces and help batteries last longer before they tap out. With electric vehicles, battery performance shapes everything from range to safety. A single glitch in purity or processing can spark real-world problems, including shorter battery life or even fires, as seen in several well-publicized EV recalls. High-quality sources of nickel sulfate can curb those risks, making this compound a touchpoint for both innovation and consumer safety.
Factories and workshops use nickel sulfate heptahydrate mainly for electroplating. The process lays down layers of nickel onto everyday items – coins, tools, car parts – to strengthen them and shield them from rust. When you notice a blend of shine and toughness in something built from metal, nickel plating may play a part. Plating lines working with this compound churn out phone components, cutlery, electronic connectors, and more. What’s at stake isn’t just appearance; it’s corrosion resistance, electrical conductivity, and health. Poorly sourced or handled chemicals in plating baths can expose workers to dangerous fumes and create toxic waste. Anyone who’s walked through an old plating shop knows the smell. Smart companies pay attention to wastewater treatment, safer handling, and even recycling. Better protections mean fewer health scares, cleaner neighborhoods, and fewer headaches for local governments.
Some fertilizer makers blend nickel sulfate heptahydrate into micronutrient formulas for plants. Nickels in tiny doses allow certain crops, including legumes, to turn airborne nitrogen into food through their roots. Without enough nickel, plants can grow slowly and make harvests less reliable. While this sounds far from batteries and chrome bumpers, it shapes food security. Only trace amounts are needed, so careful dosing keeps things safe for people, animals, and water sources. Agricultural authorities keep a close eye on how fertilizers hit the soil, but in low-income areas, regulations sometimes lag behind. National agricultural services sharing clear guidelines on safe nickel applications can bridge the gap and support better harvests.
Nickel sulfate heptahydrate demand now tracks closely with the push to electrify our grid and our vehicles. Nations with strong EV policies lean hard on reliable supplies. Reports show global nickel demand for batteries could triple this decade. Most producers come from a handful of countries, raising tough questions about transparency and security. Whenever one country dominates a supply, chances grow for price swings or, worse, forced labor spanning the supply chain. Knowing this, some battery makers partner with nickel suppliers who open their books and meet strong environmental rules. Incentives and penalties from governments can help steer investments toward more responsible mining and refining. If buyers keep pressing for certified, low-impact nickel, safer and fairer trade can gain ground.
Nickel sulfate heptahydrate might not sound glamorous, but it ties into much of what we use and depend on. It shapes battery performance, keeps metal products tough, and supports efficient farming. With growing pressure for clean tech and transparent trade, keeping this compound safe, reliable, and responsibly sourced isn’t just a technical challenge—it’s a public priority. Each step, from mine to manufacturing line, offers a chance to do better for workers, communities, and everyone who needs better batteries and sturdier tools.
Anybody working in plating shops or battery plants will spot deep green crystals of nickel sulfate heptahydrate. Sometimes it gets called just “nickel sulfate,” and it’s more common than folks might guess. This salt shows up in lithium-ion batteries, especially as carmakers switch over to electric vehicles. For me, the first introduction came with a whiff—and then, itchy hands after working near a production line. It opened my eyes.
Scientific studies call this compound a skin and respiratory irritant. A dust mask won’t always keep someone safe. Nickel ions can pass through gloves if somebody gets sloppy. The Occupational Safety and Health Administration (OSHA) lists a permissible exposure limit, because years of repeating the same mistake—maybe forgetting safety glasses, maybe brushing away some spilled powder—can lead to chronic lung problems, eczema, or even a higher chance of getting cancer down the road. Research from the International Agency for Research on Cancer (IARC) places nickel compounds in their highest-risk category.
Plenty of folks trade stories about rashes flaring up after nickel exposure. I remember one technician who shrugged off his itchy arms, then eventually sought help when his rash didn’t fade. The safety officer traced it all the way back to unwashed powder next to the controls. It goes to show that the dangers aren’t always obvious at first.
Nickel sulfate can find its way into wastewater during industrial cleaning. If local treatment plants miss it, aquatic life pays the price. Fish and invertebrates exposed to high levels sometimes die off or stop reproducing. The damage doesn’t only happen inside big factories. Improper storage has led to leaks, which reach groundwater and work their way back to the community. According to the United States Environmental Protection Agency (EPA), nickel ranks high among metals that deserve close watch.
Comfortable safety routines help make accidents rare. Colored gloves and clearly labeled storage bins turn out to be worth every extra minute. Eye washing stations and forced-air hoods may cost companies more up front, but lost workdays and medical bills eat up more in the long run. Nobody in industry enjoys added paperwork, but Material Safety Data Sheets (MSDS) need to get handed out and updated so folks know how to spot warning signs. For smaller businesses, local government training and free workshops help level the playing field.
Newer battery tech might one day push chemicals like nickel sulfate out of favor, but demand keeps rising. As a worker who’s seen the slow damage this compound can inflict, I trust in prevention above all. Good ventilation, sealed clothing, and a culture that rewards safe habits can change the story. Continued training and regular health screenings—because catching a problem early beats trying to fix it later—make a real difference. By investing in safer tools and giving people information, industries protect their greatest assets: their workforce.
Nickel sulfate heptahydrate shows up in industries like electroplating, batteries, and chemical labs. This green, crystalline compound can look harmless if you ignore the warning label, but in my own experience dealing with lab chemicals, letting your guard down around it can cause problems. Spills, skin contact, and improper storage often lead to irritation, or worse, nickel sensitivities that can last a lifetime. Respecting its hazards doesn’t take fancy equipment, just a consistent routine.
This material draws in water from the air like a thirsty sponge. It clumps, becomes slick, and may create a mess that's hard to clean. Clean, dry, and cool storage spaces keep it stable. People sometimes store it on open shelving or next to windows to “keep an eye on it,” but sunlight and warmth speed up breakdown. A shady spot with controlled humidity makes a difference. Common sense tells us to stay away from hot surfaces—nobody leaves a sugar bowl on a stove, so this shouldn’t be any different.
Storing nickel sulfate heptahydrate with strong acids, alkalis, or organic materials creates real risks. I’ve worked in shared stockrooms where someone jammed random chemicals together to save space—a habit that’s caught up to more than one technician. It only takes a little spill or a leaky package to cause a reaction that could harm people or ruin expensive equipment. Picking a shelf or cabinet just for this compound keeps it out of harm’s way.
Never trust a flimsy bag with a substance like this. From my own mishaps, I know that a cracked or weak container often leads to ruined supplies and unexpected cleanup duty. Sturdy plastic or glass with tight lids stands up to bumps and blocks vapor. Good labeling makes or breaks safety—fading tape or magic marker might seem good enough, but when you need to identify a spill or mix, bright, current labeling avoids mistakes. Train staff to check dates and conditions, which catches small issues before they threaten the workspace.
Too often, people underestimate hazards by skipping gloves or not using eye protection. Nitrile gloves, good goggles, and a lab coat are staples—not overkill. I’ve seen seasoned workers develop rashes or lung irritation simply by thinking they could get away with quick, careless handling. Investing in simple tools means fewer sick days and less time treating injuries.
I’ve mopped up my share of spills, and quick work limits damage. Neutral materials like dry sand work well to soak up and contain leaks. Never rinse nickel sulfate into the drain. Contaminated water spreads the problem beyond the work area, sometimes reaching local waterways where it threatens fish and drinking supplies. Collect all waste and follow your local hazardous disposal rules—even if someone says it “won’t matter this once.” Habits matter more than good intentions in high-stakes environments.
Weekly walkthroughs in storage spaces spot corrosion, leaks, or other warning signs before they escalate. Building a culture of double-checking, clear communication, and ongoing training keeps mistakes at bay. New staff in particular benefit from stories and lessons learned the hard way, not just written procedures shoved in a binder. Questions should be encouraged, because people face new risks every day, and mistakes travel quickly through a team.
Solid habits built around nickel sulfate heptahydrate storage help protect people and investments. Consistency, smart labeling, and real conversations about risk keep things safe and steady in workplaces where chemicals matter.
Nickel sulfate heptahydrate comes with the chemical formula NiSO4·7H2O. This formula might look like a jumble at first glance, but there's simple meaning behind each letter and number in it. The “Ni” stands for nickel, a silvery-green metal important in our daily tools and batteries. “SO4” is the sulfate group—sulfur and oxygen bonded together. The “7H2O” means this compound holds onto seven water molecules for every molecule of nickel sulfate. That’s where “heptahydrate” comes in: “hepta” for seven and “hydrate” for water.
Years ago, I visited a plating facility where workers relied on nickel sulfate heptahydrate to coat metal parts with nickel. This process, called electroplating, protects metal from rust and gives it a striking shine. The distinctive green crystals of nickel sulfate heptahydrate don’t just look interesting—they pack practical uses across manufacturing, batteries, and even agriculture. In battery factories, it’s a key ingredient for rechargeable batteries found inside electric cars and portable gadgets. Scientists and engineers have invested real effort to improve battery materials, and nickel sulfate often sits on top of their supply list for nickel-based batteries.
Even small mistakes in a chemical formula change how a compound behaves. Water molecules bonded inside nickel sulfate heptahydrate influence its stability and how easily it dissolves. Skipping those water molecules or altering their number affects the compound’s function in industrial processes. In my own experience at a chemical storeroom, mixing up formulas between the heptahydrate and other forms led to frustration. The wrong formula can throw off everything—quantities needed for reactions, expected results, and even safety measures.
The International Union of Pure and Applied Chemistry (IUPAC) sets the guidelines for naming chemicals. Their work matters: reliable labeling helps workers avoid confusion, especially since nickel sulfate can come in other hydrated forms—hexahydrate, monohydrate, and even anhydrous powder. Clear communication, double-checking the “heptahydrate” part of the formula, keeps operations safe and efficient.
Nickel sulfate heptahydrate isn’t just another chemical sitting on a shelf. Its touch or dust can irritate skin and lungs. Chronic overexposure raises health risks for workers or communities near nickel refineries. Responsible handling and storage make a big difference. Reading the label—especially recognizing the “7H2O” part—reminds handlers of the right way to treat this substance. The Environmental Protection Agency tracks nickel compounds and offers detailed guidelines on keeping workplaces safe.
Greater focus on safety and cleaner production goes a long way. Facilities benefit from regular training about chemical formulas, hazard signs, and proper disposal methods. Substituting safer chemicals when possible, and reducing total waste, cuts down risks. Open reporting helps share lessons and avoids repeat mistakes across industries. For those working with or studying chemistry, understanding the simple facts—like “NiSO4·7H2O” —lays the foundation for responsible, informed actions.
Nickel Sulfate Heptahydrate often turns up in labs and battery factories. Its green-blue crystals don’t look menacing, though the real action happens microscopically. You might think you’ve got it under control since the powder isn’t dramatic or reactive. In reality, inhaling its dust or letting it linger on bare skin could spark nasty allergies and skin conditions—in some people, those reactions stick around for life. Breathing enough of it can damage the lungs. Hearing this, my old college lab mates never touched it without double gloving. The scentless, invisible nature of the hazard always made us double check our routines.
Every expert I’ve ever met in chemical safety starts by talking about gloves, coats, and goggles. With nickel compounds, that’s just the entry ticket. The right protection makes the job bearable. Not every glove blocks nickel salts; nitrile or neoprene always got the green light in my lab. Splatters can slip through thin gloves or surprise you when cleaning spills. Face shields went on if anything might splash up. I once watched a partner clean a spill with his bare hands—angry red welts appeared within minutes. After that, folks respected the gear more.
Good ventilation proves just as important as any barrier you can wear. Any dry powder can billow if poured or mixed too roughly, so hoods or extraction fans grow critical. I used to think laminar hoods were overkill until an easy scoop sent a green puff into the air, setting off a scramble to change out of contaminated clothes. The best labs always kept wet wipes or special vacuums close by, never dry brooms or compressed air, since both spread toxic dust. Closed containers and tidy workspaces kept contamination from moving where it shouldn’t.
Washing up sounds simple, but skipping this step—especially after removing gloves, using a phone or heading for lunch—leaves you wide open. Nickel sits tight in small cracks of the skin, so lab soap and warm water (not alcohol rubs) worked better. The laundry pile in my grad school house grew instantly after we realized that sweat and nickel combined could trigger rashes just from touching pants later. Lab coats always stayed in the work area, and personal clothes went into plastic bags.
Most real-world disasters don’t start with explosions—they creep up from poor labeling or training. Good labels list chemical hazards up front, not in codes or abbreviations. Every flask and bottle needs a clear warning, so nobody grabs the wrong thing by mistake. If you don’t recognize a container’s markings, you shouldn’t handle it. At one job, we had quarterly drills: everyone from new interns to the old guard reviewed what to do in case of spill, skin contact, or even a fire. With nickel salts, people learned to use neutralizing agents like sodium carbonate and to never pour anything down a sink.
Trust in the habit—not luck. Nickel Sulfate Heptahydrate isn’t out to get anyone, but it punishes shortcuts and forgetfulness. If a lab or workshop expects to handle it, staff deserve real training, simple rules on keeping the area clean, and gear ready at hand. Telling stories of close calls or using accident reports at meetings helps keep safety fresh. Respecting these routines, nobody in my circles had serious trouble, and that’s about as real a solution as you get.


| Names | |
| Preferred IUPAC name | Nickel(2+) sulfate heptahydrate |
| Other names |
Nickel(II) sulfate heptahydrate
Nickelous sulfate heptahydrate Sulfuric acid, nickel(2+) salt, heptahydrate Nickel monosulfate heptahydrate |
| Pronunciation | /ˈnɪkəl ˈsʌl.feɪt ˌhɛp.təˈhaɪ.dreɪt/ |
| Identifiers | |
| CAS Number | 10101-97-0 |
| Beilstein Reference | 1209934 |
| ChEBI | CHEBI:78056 |
| ChEMBL | CHEMBL1201807 |
| ChemSpider | 80712 |
| DrugBank | DB14537 |
| ECHA InfoCard | 100.028.699 |
| EC Number | 232-104-9 |
| Gmelin Reference | 1642 |
| KEGG | C14376 |
| MeSH | D009589 |
| PubChem CID | 10130439 |
| RTECS number | QR9600000 |
| UNII | 9S0K33SQ79 |
| UN number | UN3077 |
| CompTox Dashboard (EPA) | `DTXSID1021277` |
| Properties | |
| Chemical formula | NiSO4·7H2O |
| Molar mass | 262.85 g/mol |
| Appearance | Blue or blue-green crystalline solid |
| Odor | Odorless |
| Density | 2.07 g/cm³ |
| Solubility in water | 960 g/L (20 °C) |
| log P | -4.50 |
| Vapor pressure | Negligible |
| Acidity (pKa) | 5.3 |
| Basicity (pKb) | 6.01 |
| Magnetic susceptibility (χ) | '+469×10⁻⁶ cm³/mol' |
| Refractive index (nD) | 1.484 |
| Dipole moment | 0 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 322.1 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -1989.0 kJ/mol |
| Pharmacology | |
| ATC code | V07AY30 |
| Hazards | |
| Main hazards | Toxic if swallowed, causes skin and serious eye irritation, may cause an allergic skin reaction, may cause cancer, suspected of damaging fertility or the unborn child, very toxic to aquatic life. |
| GHS labelling | GHS05, GHS07, GHS08, GHS09 |
| Pictograms | GHS05,GHS07,GHS09 |
| Signal word | Danger |
| Hazard statements | H302, H315, H317, H319, H334, H341, H350i, H360D, H372, H400, H410 |
| Precautionary statements | Precautionary statements: P260, P273, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P308+P313, P314 |
| Lethal dose or concentration | LD50 Oral Rat: 361 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral-rat LD50: 264 mg/kg |
| NIOSH | WN2870000 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for Nickel Sulfate Heptahydrate: 1 mg/m³ (as Ni), OSHA TWA |
| REL (Recommended) | 0.015 mg Ni/m³ |
| IDLH (Immediate danger) | Not listed |
| Related compounds | |
| Related compounds |
Nickel(II) sulfate (anhydrous)
Nickel(II) sulfate hexahydrate Cobalt(II) sulfate heptahydrate Copper(II) sulfate pentahydrate Iron(II) sulfate heptahydrate Magnesium sulfate heptahydrate |