Aluminum Hydroxide as Amphoteric Acid with NaOH

Al(OH)3 + NaOH → NaAlO2 + 2H2O

Visão geral

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.

Participantes

Papel Substância Coeficiente Estado
Reagente Aluminum Hydroxide Al(OH)₃ 1 (s)
Reagente Sodium Hydroxide NaOH 1 (aq)
Produto Water H₂O 2 (l)

Exemplo do cotidiano

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

Importância industrial

O aluminato de sódio é utilizado no tratamento de água como coagulante, no fabrico de papel e no processo Bayer, que produz anualmente mais de 130 milhões de toneladas de alumina.

Propriedades

Tipo
Acid-Base
Reversível
Não
Energia
Exotérmico
ΔH
-20,0 kJ/mol

Reações relacionadas

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.