Aluminum Hydroxide as Amphoteric Acid with NaOH

Al(OH)3 + NaOH → NaAlO2 + 2H2O

概要

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.

参加者

役割 物質 係数 状態
反応物 Aluminum Hydroxide Al(OH)₃ 1 (s)
反応物 Sodium Hydroxide NaOH 1 (aq)
生成物 Water H₂O 2 (l)

日常の例

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

産業上の重要性

アルミン酸ナトリウムは水処理における凝集剤、製紙業、そして年間1億3,000万トン以上のアルミナを生産するバイヤー法で使用されています。

特性

タイプ
Acid-Base
可逆的
いいえ
エネルギー
発熱性
ΔH
-20.0 kJ/mol

関連する反応

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) Hydrochloric Acid and Sodium Hydroxide Neutralization Nitric Acid and Potassium Hydroxide Neutralization Magnesium Hydroxide and Hydrochloric Acid (Milk of Magnesia) Hydrochloric Acid and Barium 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.