Formation of Calcium Carbonate from Oxides

CaO + CO2 → CaCO3

Overview

Calcium oxide reacts with carbon dioxide to form calcium carbonate. This is the reverse of the lime-burning process and occurs naturally in geological carbon sequestration. Limewater (calcium hydroxide solution) turns milky when CO2 is bubbled through due to this reaction.

Participants

Role Substance Coefficient State
Reactant Calcium Oxide CaO 1 (s)
Reactant Carbon Dioxide CO₂ 1 (g)
Product Calcium Carbonate CaCO₃ 1 (s)

Everyday Example

The classic limewater test for carbon dioxide relies on this reaction, as the milky precipitate is calcium carbonate.

Industrial Importance

This reaction is relevant to carbon capture technology and cement carbonation curing. It also occurs in geological weathering processes that regulate atmospheric CO2.

Properties

Type
Synthesis
Reversible
Yes
Energy
Exothermic
ΔH
-178.3 kJ/mol

Related Reactions

Fischer-Tropsch Synthesis (General) Formation of Aluminum Oxide Formation of Ammonia (Haber Process) Formation of Barium Oxide Formation of Barium Sulfate Formation of Beryllium Oxide Formation of Cadmium Oxide Formation of Calcium Hydroxide Formation of Calcium Oxide (Quicklime) Formation of Carbon Dioxide from Elements

Frequently Asked Questions

What is the equation for Formation of Calcium Carbonate from Oxides?
The balanced equation is: CaO + CO₂ → CaCO₃.
What type of reaction is Formation of Calcium Carbonate from Oxides?
Formation of Calcium Carbonate from Oxides is a synthesis reaction. It is reversible under certain conditions.
Is Formation of Calcium Carbonate from Oxides exothermic or endothermic?
Formation of Calcium Carbonate from Oxides is exothermic (releases energy). The enthalpy change (ΔH) is -178.3 kJ/mol.