carbon dioxide +limewater
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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.
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