On passing excess of co2 gas in an aqueous solution of calcium carbonate, milkiness of the solution

On passing excess of co2 gas in an aqueous solution of calcium carbona

1.	On passing excess of co2 gas in an aqueous solution of calcium carbonate, milkiness of the solution
Answer» dioxide passed into limewater gives a MILKY SOLUTION, due to PRECIPITATION of an insoluble SUSPENSION of calcium carbonate: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O. If excess CO2 is added, the following reactionCaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq) takes place: ... Themilkiness disappears since calciumbicarbonate is water-soluble.