How does carbon dioxide react with limewater?

Lime water reacts with carbon dioxide (CO2) in a two-step process. Limewater is calcium hydroxide dissolved in water.

Ca(OH)2 + H2O → Ca++ 2OH-

Then, the Ca++ reacts with the CO2 to give calcium carbonate which is very insoluble in water:

Ca(OH)2 + CO2 → CaCO3 + H2O

CaCO3 + H2O + CO2 → Ca(HCO3)2

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