Aluminum Hydroxide Precipitation

AlCl3 + 3NaOH → Al(OH)3↓ + 3NaCl

개요

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.

참여 물질

역할 물질 계수 상태
생성물 Aluminum Hydroxide Al(OH)₃ 1 (s)
생성물 Sodium Chloride NaCl 3 (aq)

일상 속 예시

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

산업적 중요성

Al(OH)₃ 응집은 전 세계적으로 가장 널리 사용되는 수처리 방법입니다. 수산화알루미늄은 난연제와 제산제로도 사용됩니다.

성질

유형
Precipitation
가역 반응
아니오
에너지
발열
ΔH
-115.0 kJ/mol

관련 반응

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.