Nickel hydroxide

CAS number : 12054-48-7

Molecular weight :92.724

Molecular formula/chemical symbol :Ni(OH)2

Description :

Molecu92.724 lar weight：92.724 g/mol (anhydrous);   110.72 g/mol (monohydrate)

CAS: 12054-48-7; 36897-37-7 (monohydrate)

Appearance: green crystals

Density: 4.10g/cm³

Melting point: 230 °C (anhydrous, decomp)

Solubility in water: 0.013 g/100 mL

Solubility: soluble in dilute acid, ammonia (monohydrate)

Nickel(II) hydroxide has two well-characterized polymorphs, its α and β forms. The α structure consists of Ni(OH)₂ layers with intercalated anions or water molecules occupying the space between layers. The β form is a hexagonal closest-packed structure of Ni²⁺ and OH^- ions, without other intercalated ions. In the presence of water, the α polymorph typically decays to the β form due to dissolution and recrystalization. In addition to the α and β polymorphs, several γ nickel hydroxides have been described, distinguished by crystal structures with much larger inter-sheet distances.

The mineral form of Ni(OH)₂, theophrastite, was first identified in the Vermion region of northern Greece, in 1980. It is found naturally as a translucent emerald-green crystal formed in thin sheets near the boundaries of idocrase or chlorite crystals.

USES :

For caustic soda batteries, alkaline batteries, nickel-plated, made the raw material of nickel salt catalyst.

Keywords:Electronic chemicals