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What happens when carbon dioxide gas is bubbled through lime water? (a) In small amount, (b) In excess?

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What happens when carbon dioxide gas is bubbled through lime water? 

(a) In small amount, 

(b) In excess?

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1 Answer

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(a) In small amount, solution becomes milky due to the formation of calcium carbonate. 

Ca(OH)2 + CO2 → CaCO3 + H2O. 

(b) In excess, milkiness disappears because calcium carbonate changes to calcium hydrogen carbonate which is colourless in nature

CaCO3 + H2O + CO2 → Ca (HCO3)2

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