Calcium Sulfate Precipitation (Gypsum)

Ca(NO3)2 + Na2SO4 → CaSO4↓ + 2NaNO3

概述

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.

参与者

角色 物质 系数 状态
反应物 Sodium Sulfate Na₂SO₄ 1 (aq)
产物 Calcium Sulfate CaSO₄ 1 (s)
产物 Sodium Nitrate NaNO₃ 2 (aq)

日常示例

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

工业重要性

石膏年产量超过2.5亿吨,用于干墙板、灰泥、水泥和土壤改良。电厂烟气脱硫石膏正变得越来越重要。

属性

类型
Precipitation
可逆
否
能量
放热
ΔH
-8.0 kJ/mol

相关反应

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.