Copper Sulfide Precipitation

CuSO₄ + Na₂S → CuS↓ + Na₂SO₄

Visão geral

Copper sulfate reacts with sodium sulfide to form a black precipitate of copper(II) sulfide (Ksp = 1.3 × 10⁻³⁶). CuS is one of the most insoluble compounds known. The jet-black precipitate forms instantly and is used to identify Cu²⁺ ions in systematic qualitative analysis.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Copper(II) Sulfate CuSO₄	1	(aq)
Produto	Sodium Sulfate Na₂SO₄	1	(aq)

Exemplo do cotidiano

The black tarnish on copper pots exposed to sulfur-containing foods (eggs, garlic) is related to copper sulfide formation.

Importância industrial

A precipitação de sulfuretos é utilizada no tratamento de águas residuais mineiras para remover metais pesados. O CuS (covelite) é também um mineral de minério de cobre de ocorrência natural.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -84,0 kJ/mol

Reações 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 Copper Sulfide Precipitation?

The balanced equation is: CuSO₄ + Na₂S → CuS↓ + Na₂SO₄.

What type of reaction is Copper Sulfide Precipitation?

Copper Sulfide Precipitation is a precipitation reaction.

Is Copper Sulfide Precipitation exothermic or endothermic?

Copper Sulfide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -84.0 kJ/mol.