Calcium Hydroxide and Carbon Dioxide (Limewater Test)
Ca(OH)2 + CO2 → CaCO3 + H2O
Обзор
Calcium hydroxide solution (limewater) turns milky white when carbon dioxide is bubbled through it, due to the formation of insoluble calcium carbonate particles. This is the classic test for carbon dioxide gas. With excess CO2, the milkiness disappears as soluble calcium bicarbonate forms.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Calcium Hydroxide Ca(OH)₂ | 1 | (aq) |
| Реагент | Carbon Dioxide CO₂ | 1 | (g) |
| Продукт | Calcium Carbonate CaCO₃ | 1 | (s) |
| Продукт | Water H₂O | 1 | (l) |
Пример из жизни
The limewater test is taught in every introductory chemistry course as the standard qualitative test for carbon dioxide gas.
Промышленное значение
This reaction is used in flue gas desulfurization, carbon capture, and in the production of precipitated calcium carbonate for paper and paint industries.
Свойства
- Обратимая
- Нет
- Энергия
- Экзотермическая
- ΔH
- -113,0 kJ/mol
Связанные реакции
Iron(III) Chloride and Sodium Hydroxide
Calcium Chloride and Sodium Carbonate
Barium Chloride and Sodium Sulfate Precipitation
Magnesium Hydroxide and Hydrochloric Acid (Antacid)
Lead Nitrate and Potassium Iodide (Golden Rain)
Copper(II) Sulfate and Sodium Hydroxide
Sodium Hydroxide and Iron(III) Chloride (Rust Color)
Sodium Hydroxide and Hydrochloric Acid Neutralization
Sodium Carbonate and Hydrochloric Acid
Aluminum Hydroxide and Hydrochloric Acid
Frequently Asked Questions
What is the equation for Calcium Hydroxide and Carbon Dioxide (Limewater Test)?
The balanced equation is: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O.
What type of reaction is Calcium Hydroxide and Carbon Dioxide (Limewater Test)?
Calcium Hydroxide and Carbon Dioxide (Limewater Test) is a double replacement reaction.
Is Calcium Hydroxide and Carbon Dioxide (Limewater Test) exothermic or endothermic?
Calcium Hydroxide and Carbon Dioxide (Limewater Test) is exothermic (releases energy). The enthalpy change (ΔH) is -113.0 kJ/mol.