Zinc Hydroxide as Amphoteric Acid with NaOH

Zn(OH)2 + 2NaOH → Na2[Zn(OH)4]

Visão geral

Zinc hydroxide dissolves in excess sodium hydroxide to form the soluble tetrahydroxozincate complex. This demonstrates zinc hydroxide's acidic character. The initial white precipitate formed by adding NaOH to Zn²⁺ dissolves upon addition of excess base, a key observation in qualitative analysis.

Participantes

Papel Substância Coeficiente Estado
Reagente Sodium Hydroxide NaOH 2 (aq)

Exemplo do cotidiano

In qualitative analysis labs, students observe the zinc precipitate dissolving in excess NaOH as proof of zinc's amphoteric nature.

Importância industrial

A solução de zincato é utilizada em banhos de galvanoplastia alcalina de zinco, em processos de galvanização e na produção de óxido de zinco.

Propriedades

Tipo
Acid-Base
Reversível
Sim
Energia
Exotérmico
ΔH
-15,0 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 Hydroxide as Amphoteric Acid with NaOH Aluminum Chloride and Chloride Ion (Lewis Acid-Base) Formic Acid and Sodium Hydroxide

Frequently Asked Questions

What is the equation for Zinc Hydroxide as Amphoteric Acid with NaOH?
The balanced equation is: Zn(OH)₂ + 2NaOH → Na₂[Zn(OH)₄].
What type of reaction is Zinc Hydroxide as Amphoteric Acid with NaOH?
Zinc Hydroxide as Amphoteric Acid with NaOH is a acid-base reaction. It is reversible under certain conditions.
Is Zinc Hydroxide as Amphoteric Acid with NaOH exothermic or endothermic?
Zinc Hydroxide as Amphoteric Acid with NaOH is exothermic (releases energy). The enthalpy change (ΔH) is -15.0 kJ/mol.