Cobalt(II) Hydroxide Precipitation
CoCl2 + 2NaOH → Co(OH)2↓ + 2NaCl
Tổng quan
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.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Sodium Hydroxide NaOH | 2 | (aq) |
| Sản phẩm | Sodium Chloride NaCl | 2 | (aq) |
Ví dụ thực tế
Cobalt chloride paper changes from blue (dry) to pink (wet) and is used as a humidity indicator in weather instruments.
Tầm quan trọng công nghiệp
Cobalt hydroxide is a precursor for lithium cobalt oxide cathodes in lithium-ion batteries used in smartphones and electric vehicles.
Tính chất
- Loại
- Precipitation
- Thuận nghịch
- Không
- Năng lượng
- Tỏa nhiệt
- ΔH
- -52,0 kJ/mol
Phản ứng liên quan
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.