Question

What is observed when carbon dioxide gas pass through lime water 1.for a short duration 2.for a long duration and also write the chemical equation for the reaction envolved

Answer 1

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When carbon dioxide gas is passed through lime water for a considerable time ,then the white precipitate of calcium carbonate which is formed initially as shown in the above reaction ,dissolves due to formation of a soluble salt calcium hydrogen carbonate and the solution becomes clear again.

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Answer 2

Solution:

i) 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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