Question

why the milky colour disappear when excess of carbon dioxide is passed through lime water solution?

Answer 1

When excess of carbon dioxide is passed through lime water than CaCO3 is formed which is soluble in water.......

Answer 2

When carbon dioxide gas is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.

Ca(OH)2 + CO2 → CaCO3 + H2O

However, when excess of carbon dioxide is passed through this solution, the milkyness disappears. This is due the formation of calcium bicarbonate, which is soluble in water. Thus, a clear solution is obtained.

CaCO3 + H2O + CO2 → Ca(HCO3)2


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