Copper Sulfide Precipitation

CuSO4 + Na2S → CuS↓ + Na2SO4

Descripción general

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

Rol Sustancia Coeficiente Estado
Reactivo Copper(II) Sulfate CuSO₄ 1 (aq)
Producto Sodium Sulfate Na₂SO₄ 1 (aq)

Ejemplo cotidiano

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

Importancia industrial

La precipitación de sulfuros se utiliza en el tratamiento de aguas residuales mineras para eliminar metales pesados. El CuS (covelita) también es un mineral natural de cobre.

Propiedades

Tipo
Precipitation
Reversible
No
Energía
Exotérmico
ΔH
-84,0 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 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.