Zinc Hydroxide Precipitation

ZnSO₄ + 2NaOH → Zn(OH)₂↓ + Na₂SO₄

Descripción general

Zinc sulfate reacts with sodium hydroxide to form a white gelatinous precipitate of zinc hydroxide (Ksp = 3.0 × 10⁻¹⁷). Zn(OH)₂ is amphoteric, dissolving in excess NaOH to form the zincate ion [Zn(OH)₄]²⁻. This amphoteric behavior is a diagnostic test for zinc in qualitative analysis.

Participantes

Rol	Sustancia	Coeficiente	Estado
Reactivo	Zinc Sulfate ZnSO₄	1	(aq)
Reactivo	Sodium Hydroxide NaOH	2	(aq)
Producto	Sodium Sulfate Na₂SO₄	1	(aq)

Ejemplo cotidiano

Calamine lotion contains zinc compounds that form protective precipitates on skin, soothing itching from insect bites and rashes.

Importancia industrial

Relevante en el tratamiento de efluentes industriales con zinc y en la preparación de precursores de óxido de zinc.

Propiedades

Tipo: Precipitation
Reversible: No
Energía: Exotérmico
ΔH: -38,0 kJ/mol

Reacciones relacionadas

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Lead Chloride Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Zinc Hydroxide Precipitation?

The balanced equation is: ZnSO₄ + 2NaOH → Zn(OH)₂↓ + Na₂SO₄.

What type of reaction is Zinc Hydroxide Precipitation?

Zinc Hydroxide Precipitation is a precipitation reaction.

Is Zinc Hydroxide Precipitation exothermic or endothermic?

Zinc Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -38.0 kJ/mol.