Calcium Sulfate Precipitation (Gypsum)

Ca(NO₃)₂ + Na₂SO₄ → CaSO₄↓ + 2NaNO₃

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Sodium Sulfate Na₂SO₄	1	(aq)
Sản phẩm	Calcium Sulfate CaSO₄	1	(s)
Sản phẩm	Sodium Nitrate NaNO₃	2	(aq)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

Gypsum production exceeds 250 million tonnes annually for drywall, plaster, cement, and soil amendment. FGD gypsum from power plants is increasingly important.

Tính chất

Loại: Precipitation
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -8,0 kJ/mol

Phản ứng liên quan

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 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.