Question

what do you observe!
Carbon dioxide is passed through lime water first a little, then in excess.
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Answer 1

Answer:

when CO2 gas is passed through lime water it turns milky due to the formation of calcium carbonate which formula is CaCO3. when excess of carbon dioxide is passed through calcium carbonate calcium hydrogen carbonate is formed and solution become colourless.

Answer 2

Explanation:

For short duration:

When calcium hydroxide(lime water) solution reacts with carbon dioxide gas,the Limewater turns milky due to the formation of a white precipitate of calcium carbonate (CaCO3) which is insoluble in water.

Ca(OH)2(aq) + CO2(g) ------> CaCO3 (s) + H2O(l)

ii) for long duration:

When excess of carbon dioxide gas is passed through lime water then the white precipitate calcium carbonate formed first dissolves due  to the formation of a soluble salt calcium hydrogen carbonate (Ca(HCO3)2, and the Solution becomes clear again.

CaCO3 (s) + H2O(l) + CO2(g) ------> Ca(HCO3)2.

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