The milkness disappears on passing excess of carbondioxide to lime water give reason
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The milkiness disappears on passing excess of carbon dioxide to lime water due to formation of Calcium bicarbonate
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.)
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