Calcium Chloride and Sodium Carbonate
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
Overview
Calcium chloride reacts with sodium carbonate to form insoluble calcium carbonate precipitate and sodium chloride. This is the basis of the water softening process where dissolved calcium ions are removed as insoluble carbonate. The white precipitate settles as chalk-like material.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Sodium Carbonate Na₂CO₃ | 1 | (aq) |
| Product | Calcium Carbonate CaCO₃ | 1 | (s) |
| Product | Sodium Chloride NaCl | 2 | (aq) |
Everyday Example
Water softening systems in homes remove calcium hardness by precipitating calcium carbonate, reducing limescale buildup in pipes and appliances.
Industrial Importance
This reaction is fundamental to industrial water softening, paper manufacturing (calcium carbonate filler), and the Solvay process for sodium carbonate production.
Properties
- Type
- Double Replacement
- Reversible
- No
- Energy
- Exothermic
- ΔH
- -13.0 kJ/mol
Related Reactions
Aluminum Hydroxide and Hydrochloric Acid
Ammonia and Hydrochloric Acid (White Smoke)
Barium Chloride and Sodium Sulfate Precipitation
Calcium Carbonate and Hydrochloric Acid
Calcium Hydroxide and Carbon Dioxide (Limewater Test)
Calcium Hydroxide and Sulfuric Acid
Copper(II) Sulfate and Sodium Hydroxide
Iron(III) Chloride and Sodium Hydroxide
Lead Nitrate and Potassium Iodide (Golden Rain)
Magnesium Hydroxide and Hydrochloric Acid (Antacid)
Frequently Asked Questions
What is the equation for Calcium Chloride and Sodium Carbonate?
The balanced equation is: CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl.
What type of reaction is Calcium Chloride and Sodium Carbonate?
Calcium Chloride and Sodium Carbonate is a double replacement reaction.
Is Calcium Chloride and Sodium Carbonate exothermic or endothermic?
Calcium Chloride and Sodium Carbonate is exothermic (releases energy). The enthalpy change (ΔH) is -13.0 kJ/mol.