Calcium Sulfate Precipitation (Gypsum)
Ca(NO3)2 + Na2SO4 → CaSO4↓ + 2NaNO3
概要
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.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Sodium Sulfate Na₂SO₄ | 1 | (aq) |
| 生成物 | Calcium Sulfate CaSO₄ | 1 | (s) |
| 生成物 | Sodium Nitrate NaNO₃ | 2 | (aq) |
日常の例
Drywall (gypsum board) used in nearly every building contains calcium sulfate dihydrate, produced by similar precipitation chemistry.
産業上の重要性
石膏の生産量は年間2億5,000万トンを超え、石膏ボード、漆喰、セメント、土壌改良剤に使用されています。発電所からのFGD石膏の重要性が増しています。
特性
- タイプ
- Precipitation
- 可逆的
- いいえ
- エネルギー
- 発熱性
- ΔH
- -8.0 kJ/mol
関連する反応
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.