Calcium Carbonate and Hydrochloric Acid (Antacid)
CaCO3 + 2HCl → CaCl2 + H2O + CO2
Overview
Calcium carbonate, found in Tums antacid tablets, neutralizes hydrochloric acid in the stomach to form calcium chloride, water, and carbon dioxide gas. The carbonate ion acts as a base, accepting protons from HCl. The CO₂ evolved can cause belching.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Calcium Carbonate CaCO₃ | 1 | (s) |
| Reactant | Hydrochloric Acid HCl | 2 | (aq) |
| Product | Water H₂O | 1 | (l) |
| Product | Carbon Dioxide CO₂ | 1 | (g) |
Everyday Example
Tums antacid tablets work by this exact reaction, neutralizing excess stomach acid and providing relief from heartburn.
Industrial Importance
Calcium carbonate is used extensively in acid neutralization applications including water treatment, flue gas desulfurization, and soil pH adjustment in agriculture.
Properties
- Type
- Acid-Base
- Reversible
- No
- Energy
- Exothermic
- ΔH
- -15.3 kJ/mol
Related Reactions
Acetic Acid and Sodium Acetate Buffer System
Acetic Acid and Sodium Hydroxide Neutralization
Acetic Acid Dissociation in Water
Aluminum Chloride and Chloride Ion (Lewis Acid-Base)
Aluminum Hydroxide as Amphoteric Acid with NaOH
Aluminum Hydroxide as Amphoteric Base with HCl
Ammonia and Ammonium Chloride Buffer System
Ammonia and Hydrochloric Acid
Ascorbic Acid and Sodium Hydroxide
Barium Hydroxide and Ammonium Thiocyanate (Endothermic)
Frequently Asked Questions
What is the equation for Calcium Carbonate and Hydrochloric Acid (Antacid)?
The balanced equation is: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂.
What type of reaction is Calcium Carbonate and Hydrochloric Acid (Antacid)?
Calcium Carbonate and Hydrochloric Acid (Antacid) is a acid-base reaction.
Is Calcium Carbonate and Hydrochloric Acid (Antacid) exothermic or endothermic?
Calcium Carbonate and Hydrochloric Acid (Antacid) is exothermic (releases energy). The enthalpy change (ΔH) is -15.3 kJ/mol.