Copper(II) Hydroxide Precipitation

CuSO₄ + 2NaOH → Cu(OH)₂↓ + Na₂SO₄

Aperçu

Copper sulfate reacts with sodium hydroxide to form a pale blue gelatinous precipitate of copper(II) hydroxide (Ksp = 2.2 × 10⁻²⁰). The precipitate can be dehydrated by heating to produce black copper(II) oxide. This reaction is the basis of the Biuret test for proteins.

Participants

Rôle	Substance	Coefficient	État
Réactif	Copper(II) Sulfate CuSO₄	1	(aq)
Réactif	Sodium Hydroxide NaOH	2	(aq)
Produit	Sodium Sulfate Na₂SO₄	1	(aq)

Exemple du quotidien

The Biuret test for proteins uses Cu(OH)₂ formed from copper sulfate and NaOH; proteins turn the mixture violet due to copper-peptide bond complexation.

Importance industrielle

Copper hydroxide is used as a fungicide (Bordeaux mixture), in copper electroplating solutions, and as a precursor to copper oxide catalysts.

Propriétés

Type: Precipitation
Réversible: Non
Énergie: Exothermique
ΔH: -59,0 kJ/mol

Réactions associées

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(II) Hydroxide Precipitation?

The balanced equation is: CuSO₄ + 2NaOH → Cu(OH)₂↓ + Na₂SO₄.

What type of reaction is Copper(II) Hydroxide Precipitation?

Copper(II) Hydroxide Precipitation is a precipitation reaction.

Is Copper(II) Hydroxide Precipitation exothermic or endothermic?

Copper(II) Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -59.0 kJ/mol.