Question

When we pass carbon dioxide(CO2) through lime water for a long time it becomes a clear solution. Why?

Answer 1

formation of water soluble calcium bicarbonate

When CO2 is passed through lime water, it turns milky due to the formation of calcium carbonate which is sinsoluble in water.

limewaterCa(OH)2+CO2⟶milkinessCaCO3+H2O

However, when excess of CO2 is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate which is colorless and soluble in water.

milkinessCaCO3+H2O+excessCO2⟶water solubleCa(HCO3)2

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Answer 2

When c02 is passed through lime water , it turns milky due to formation of calcium carbonate which is sinsoluble in water...