High Purity Nickel Sulphate 

1. Appearance: Nickel sulfate typically appears as green or blue-green crystals in its hydrated forms (e.g., nickel sulfate hexahydrate, NiSO₄·6H₂O), which is the most common.
2. Molar Mass:
   • Anhydrous: 154.75 g/mol
   • Hexahydrate: 262.85 g/mol
3. Density:
   • Hexahydrate: 2.07 g/cm³
   • Anhydrous: 4.01 g/cm³
4. Melting Point:
   • Anhydrous: Decomposes above 840°C
   • Hexahydrate: Loses water at around 100°C, converting to anhydrous form.
5. Solubility: Highly soluble in water (e.g., 65 g/100 mL at 20°C for the hexahydrate), but insoluble in ethanol, ethyl ether, and neutral solvents.

1. Formula: NiSO₄
2. Nature: It’s a salt formed from nickel(II) cations (Ni²⁺) and sulfate anions (SO₄²⁻).
3. Reactivity:
   • Reacts with bases to form nickel hydroxide (Ni(OH)₂).
   • Can form complexes with ligands like ammonia or water due to the nickel(II) ion’s coordination chemistry.
   • In aqueous solution, it dissociates into Ni²⁺ and SO₄²⁻ ions.
4. pH: Solutions of nickel sulfate are acidic due to the hydrolysis of the Ni²⁺ ion in water.
5. Nickel Sulfate Hexahydrate (NiSO₄·6H₂O): Most widely encountered, used in electroplating and as a precursor for other nickel compounds.
6. Applications:

   • Used in electroplating to deposit nickel coatings.
   • A component in nickel-cadmium batteries.
   • Employed in the production of catalysts and as a mordant in dyeing.