Zinc Hydroxide Precipitation

ZnSO₄ + 2NaOH → Zn(OH)₂↓ + Na₂SO₄

Visão geral

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

Papel	Substância	Coeficiente	Estado
Reagente	Zinc Sulfate ZnSO₄	1	(aq)
Reagente	Sodium Hydroxide NaOH	2	(aq)
Produto	Sodium Sulfate Na₂SO₄	1	(aq)

Exemplo do cotidiano

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

Importância industrial

A precipitação de hidróxido de zinco é utilizada na recuperação de zinco de águas residuais, na produção de loção de calamina e como precursor de óxido de zinco.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -38,0 kJ/mol

Reações relacionadas

Aluminum Hydroxide Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Phosphate Precipitation (Bone Mineral) Chromium(III) Hydroxide Precipitation Lead Carbonate Precipitation Magnesium Hydroxide Precipitation Copper Sulfide Precipitation Cobalt(II) Hydroxide 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.