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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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.