Calcium Sulfate Precipitation (Gypsum)

Ca(NO₃)₂ + Na₂SO₄ → CaSO₄↓ + 2NaNO₃

Visão geral

Calcium nitrate reacts with sodium sulfate to precipitate calcium sulfate (Ksp = 4.9 × 10⁻⁵). CaSO₄ is sparingly soluble, not truly insoluble. The dihydrate form (CaSO₄·2H₂O) is gypsum, one of the most important construction materials. Plaster of Paris is the hemihydrate form.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Sodium Sulfate Na₂SO₄	1	(aq)
Produto	Calcium Sulfate CaSO₄	1	(s)
Produto	Sodium Nitrate NaNO₃	2	(aq)

Exemplo do cotidiano

Drywall (gypsum board) used in nearly every building contains calcium sulfate dihydrate, produced by similar precipitation chemistry.

Importância industrial

A produção de gesso ultrapassa 250 milhões de toneladas anuais para placas de gesso cartonado, reboco, cimento e correção de solos. O gesso de dessulfuração de gases de centrais elétricas é cada vez mais importante.

Propriedades

Tipo: Precipitation
Reversível: Não
Energia: Exotérmico
ΔH: -8,0 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 Calcium Sulfate Precipitation (Gypsum)?

The balanced equation is: Ca(NO₃)₂ + Na₂SO₄ → CaSO₄↓ + 2NaNO₃.

What type of reaction is Calcium Sulfate Precipitation (Gypsum)?

Calcium Sulfate Precipitation (Gypsum) is a precipitation reaction.

Is Calcium Sulfate Precipitation (Gypsum) exothermic or endothermic?

Calcium Sulfate Precipitation (Gypsum) is exothermic (releases energy). The enthalpy change (ΔH) is -8.0 kJ/mol.