Aluminum Hydroxide Precipitation

AlCl₃ + 3NaOH → Al(OH)₃↓ + 3NaCl

Обзор

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.

Участники

Роль	Вещество	Коэффициент	Состояние
Продукт	Aluminum Hydroxide Al(OH)₃	1	(s)
Продукт	Sodium Chloride NaCl	3	(aq)

Пример из жизни

Water treatment plants use aluminum salts to form Al(OH)₃ flocs that trap suspended particles, clarifying drinking water.

Промышленное значение

Al(OH)₃ coagulation is the most widely used water purification method globally. Aluminum hydroxide is also used as a fire retardant and antacid.

Свойства

Тип: Precipitation
Обратимая: Нет
Энергия: Экзотермическая
ΔH: -115,0 kJ/mol

Связанные реакции

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 Calcium Carbonate Precipitation 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.