Cobalt(II) Hydroxide Precipitation

CoCl2 + 2NaOH → Co(OH)2↓ + 2NaCl

Visão geral

Cobalt(II) chloride reacts with NaOH to form a blue or pink precipitate of cobalt(II) hydroxide (Ksp = 5.9 × 10⁻¹⁶). The initial blue precipitate converts to pink upon standing as the crystal structure rearranges. In air, it slowly oxidizes to brown Co(OH)₃.

Participantes

Papel Substância Coeficiente Estado
Reagente Sodium Hydroxide NaOH 2 (aq)
Produto Sodium Chloride NaCl 2 (aq)

Exemplo do cotidiano

Cobalt chloride paper changes from blue (dry) to pink (wet) and is used as a humidity indicator in weather instruments.

Importância industrial

O hidróxido de cobalto é um precursor dos cátodos de óxido de cobalto e lítio em baterias de iões de lítio utilizadas em smartphones e veículos elétricos.

Propriedades

Tipo
Precipitation
Reversível
Não
Energia
Exotérmico
ΔH
-52,0 kJ/mol

Reações relacionadas

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 Cobalt(II) Hydroxide Precipitation?
The balanced equation is: CoCl₂ + 2NaOH → Co(OH)₂↓ + 2NaCl.
What type of reaction is Cobalt(II) Hydroxide Precipitation?
Cobalt(II) Hydroxide Precipitation is a precipitation reaction.
Is Cobalt(II) Hydroxide Precipitation exothermic or endothermic?
Cobalt(II) Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -52.0 kJ/mol.