Zinc Hydroxide as Amphoteric Acid with NaOH

Zn(OH)2 + 2NaOH → Na2[Zn(OH)4]

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Sodium Hydroxide NaOH 2 (aq)

Alltägliches Beispiel

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

Industrielle Bedeutung

The zincate solution is used in alkaline zinc electroplating baths, in galvanizing processes, and in the production of zinc oxide.

Eigenschaften

Typ
Acid-Base
Reversibel
Ja
Energie
Exotherm
ΔH
-15,0 kJ/mol

Verwandte Reaktionen

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.