Cobalt(II) Hydroxide Precipitation

CoCl2 + 2NaOH → Co(OH)2↓ + 2NaCl

概述

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.

参与者

角色 物质 系数 状态
反应物 Sodium Hydroxide NaOH 2 (aq)
产物 Sodium Chloride NaCl 2 (aq)

日常示例

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

工业重要性

氢氧化钴是智能手机和电动汽车用锂离子电池中钴酸锂正极的前驱体。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-52.0 kJ/mol

相关反应

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.