Calcium Carbonate Precipitation
CaCl2 + Na2CO3 → CaCO3↓ + 2NaCl
Обзор
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.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Sodium Carbonate Na₂CO₃ | 1 | (aq) |
| Продукт | Calcium Carbonate CaCO₃ | 1 | (s) |
| Продукт | Sodium Chloride NaCl | 2 | (aq) |
Пример из жизни
Limescale buildup in kettles and pipes is calcium carbonate precipitated from hard water when heated or evaporated.
Промышленное значение
Precipitated calcium carbonate (PCC) is used as a paper filler, in paints, plastics, and pharmaceuticals. Water softening by carbonate precipitation is a major industrial process.
Свойства
- Тип
- Precipitation
- Обратимая
- Нет
- Энергия
- Экзотермическая
- ΔH
- -13,0 kJ/mol
Связанные реакции
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.