Nickel Hydroxide Precipitation

NiCl₂ + 2NaOH → Ni(OH)₂↓ + 2NaCl

Aperçu

Nickel chloride reacts with sodium hydroxide to form a green precipitate of nickel(II) hydroxide (Ksp = 5.5 × 10⁻¹⁶). The apple-green precipitate does not dissolve in excess NaOH (not amphoteric) but dissolves in ammonia to form the deep blue hexaammine nickel(II) complex.

Participants

Rôle	Substance	Coefficient	État
Réactif	Sodium Hydroxide NaOH	2	(aq)
Produit	Sodium Chloride NaCl	2	(aq)

Exemple du quotidien

Nickel hydroxide is the active material in rechargeable nickel-metal hydride (NiMH) batteries used in hybrid cars and consumer electronics.

Importance industrielle

Nickel hydroxide is a critical battery material for NiCd and NiMH batteries, and is also used in nickel plating and as a catalyst precursor.

Propriétés

Type: Precipitation
Réversible: Non
Énergie: Exothermique
ΔH: -55,0 kJ/mol

Réactions associées

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Lead Chloride Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Nickel Hydroxide Precipitation?

The balanced equation is: NiCl₂ + 2NaOH → Ni(OH)₂↓ + 2NaCl.

What type of reaction is Nickel Hydroxide Precipitation?

Nickel Hydroxide Precipitation is a precipitation reaction.

Is Nickel Hydroxide Precipitation exothermic or endothermic?

Nickel Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -55.0 kJ/mol.