Zinc Hydroxide Precipitation

ZnSO4 + 2NaOH → Zn(OH)2↓ + Na2SO4

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Zinc Sulfate ZnSO₄ 1 (aq)
Reaktant Sodium Hydroxide NaOH 2 (aq)
Produkt Sodium Sulfate Na₂SO₄ 1 (aq)

Alltägliches Beispiel

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

Industrielle Bedeutung

Zinc hydroxide precipitation is used in zinc recovery from wastewater, in calamine lotion production, and as a precursor to zinc oxide.

Eigenschaften

Typ
Precipitation
Reversibel
Nein
Energie
Exotherm
ΔH
-38,0 kJ/mol

Verwandte Reaktionen

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.