Aluminum Hydroxide as Amphoteric Acid with NaOH

Al(OH)3 + NaOH → NaAlO2 + 2H2O

概述

Aluminum hydroxide dissolves in sodium hydroxide solution, demonstrating its acidic character. The Al(OH)₃ acts as a Lewis acid, accepting OH⁻ to form the aluminate ion [Al(OH)₄]⁻. This amphoteric behavior is characteristic of elements near the metal-nonmetal boundary in the periodic table.

参与者

角色 物质 系数 状态
反应物 Aluminum Hydroxide Al(OH)₃ 1 (s)
反应物 Sodium Hydroxide NaOH 1 (aq)
产物 Water H₂O 2 (l)

日常示例

The Bayer process for aluminum production exploits this amphoteric behavior, dissolving aluminum oxide in NaOH to separate it from iron oxide impurities.

工业重要性

铝酸钠用作水处理中的絮凝剂、造纸工业原料,以及拜耳法中使用(每年生产超过1.3亿吨氧化铝)。

属性

类型
Acid-Base
可逆
否
能量
放热
ΔH
-20.0 kJ/mol

相关反应

Hydrochloric Acid and Barium Hydroxide Acetic Acid and Sodium Acetate Buffer System Acetic Acid Dissociation in Water Ammonia and Hydrochloric Acid Ascorbic Acid and Sodium Hydroxide Barium Hydroxide and Ammonium Thiocyanate (Endothermic) Carbonic Acid and Sodium Hydroxide Aluminum Chloride and Chloride Ion (Lewis Acid-Base) Acetic Acid and Sodium Hydroxide Neutralization Formic Acid and Sodium Hydroxide

Frequently Asked Questions

What is the equation for Aluminum Hydroxide as Amphoteric Acid with NaOH?
The balanced equation is: Al(OH)₃ + NaOH → NaAlO₂ + 2H₂O.
What type of reaction is Aluminum Hydroxide as Amphoteric Acid with NaOH?
Aluminum Hydroxide as Amphoteric Acid with NaOH is a acid-base reaction.
Is Aluminum Hydroxide as Amphoteric Acid with NaOH exothermic or endothermic?
Aluminum Hydroxide as Amphoteric Acid with NaOH is exothermic (releases energy). The enthalpy change (ΔH) is -20.0 kJ/mol.