Calcium Carbonate Precipitation
CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl
概要
Calcium chloride reacts with sodium carbonate to precipitate calcium carbonate. CaCO₃ has a Ksp of 3.4 × 10⁻⁹. This is the fundamental reaction behind water softening, where dissolved calcium (hardness) is removed as insoluble carbonate. The precipitate is a white powder.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Sodium Carbonate Na₂CO₃ | 1 | (aq) |
| 生成物 | Calcium Carbonate CaCO₃ | 1 | (s) |
| 生成物 | Sodium Chloride NaCl | 2 | (aq) |
日常の例
Limescale buildup in kettles and pipes is calcium carbonate precipitated from hard water when heated or evaporated.
産業上の重要性
沈降性炭酸カルシウム(PCC)は、紙の充填剤、塗料、プラスチック、医薬品に使用されています。炭酸塩沈殿による軟水化は主要な工業プロセスです。
特性
- タイプ
- Precipitation
- 可逆的
- いいえ
- エネルギー
- 発熱性
- ΔH
- -13.0 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 Carbonate Precipitation?
The balanced equation is: CaCl₂ + Na₂CO₃ → CaCO₃↓ + 2NaCl.
What type of reaction is Calcium Carbonate Precipitation?
Calcium Carbonate Precipitation is a precipitation reaction.
Is Calcium Carbonate Precipitation exothermic or endothermic?
Calcium Carbonate Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -13.0 kJ/mol.