Aluminum Hydroxide Precipitation
AlCl3 + 3NaOH → Al(OH)3↓ + 3NaCl
Tổng quan
Aluminum chloride reacts with sodium hydroxide to form a white gelatinous precipitate of aluminum hydroxide (Ksp = 3 × 10⁻³⁴). Al(OH)₃ is amphoteric: it dissolves in excess NaOH to form aluminate [Al(OH)₄]⁻. The gelatinous precipitate is an excellent flocculating agent.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Sản phẩm | Aluminum Hydroxide Al(OH)₃ | 1 | (s) |
| Sản phẩm | Sodium Chloride NaCl | 3 | (aq) |
Ví dụ thực tế
Water treatment plants use aluminum salts to form Al(OH)₃ flocs that trap suspended particles, clarifying drinking water.
Tầm quan trọng công nghiệp
Al(OH)₃ coagulation is the most widely used water purification method globally. Aluminum hydroxide is also used as a fire retardant and antacid.
Tính chất
- Loại
- Precipitation
- Thuận nghịch
- Không
- Năng lượng
- Tỏa nhiệt
- ΔH
- -115,0 kJ/mol
Phản ứng liên quan
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Cadmium Sulfide Precipitation (Yellow)
Calcium Phosphate Precipitation (Bone Mineral)
Chromium(III) Hydroxide Precipitation
Lead Carbonate Precipitation
Magnesium Hydroxide Precipitation
Copper Sulfide Precipitation
Cobalt(II) Hydroxide Precipitation
Mercury(II) Sulfide Precipitation (Vermilion)
Iron(III) Hydroxide Precipitation
Frequently Asked Questions
What is the equation for Aluminum Hydroxide Precipitation?
The balanced equation is: AlCl₃ + 3NaOH → Al(OH)₃↓ + 3NaCl.
What type of reaction is Aluminum Hydroxide Precipitation?
Aluminum Hydroxide Precipitation is a precipitation reaction.
Is Aluminum Hydroxide Precipitation exothermic or endothermic?
Aluminum Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -115.0 kJ/mol.