Question

why when co2 gas is passed in excess through lime water milkiness disappears?

Answer 1

If you pass excess CO2 through lime-water, the CaCO3 reacts with the excess CO2 and water to form calcium hydrogen carbonate or calcium bicarbonate. Calcium bicarbonate is soluble in water and thus the milkiness dissolves in water.

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Answer 2

hey mate!!

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When CO2 is passed through lime-water, it turns milky due to the formation of an insoluble precipitate of Calcium Carbonate.

The following reaction takes place:

Ca(OH)2 + CO2(g)>>>>>>CaCO3(s) + H2O(l) where the Ca(OH)2 is lime-water. The CaCO3 precipitate causes the milkiness.

If you pass excess CO2 through lime-water, the CaCO3 reacts with the excess CO2 and water to form calcium hydrogen carbonate or calcium bicarbonate. Calcium bicarbonate is soluble in water and thus the milkiness dissolves in water.

The balanced chemical reaction is given by:

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

hope it helps!!