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 Sulfate Precipitation
Cadmium Sulfide Precipitation (Yellow)
Calcium Phosphate Precipitation (Bone Mineral)
Chromium(III) Hydroxide Precipitation
Lead Carbonate Precipitation
Magnesium Hydroxide Precipitation
Copper Sulfide Precipitation
Mercury(II) Sulfide Precipitation (Vermilion)
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.