Q2 of 55 Page 26

What happens when CO2 gas is passed through lime water?

Lime water is a solution of calcium hydroxide (Ca(OH)2). When CO2 gas is passed through lime water, the following reaction occurs.



The solution of lime water turns milky due to the formation of calcium carbonate, which is a white precipitate insoluble in water.


If CO2 gas is passed in excess amounts, then the above reaction occurs further.



The product formed is calcium hydrogen carbonate, which is soluble in water. Hence the milky solution becomes a clear solution.


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