Question

Why does milkiness disappear when carbon dioxide is passed through lime water in excess

Answer 1

Milkiness disappear when carbon dioxide is passed through lime water in excess because calcium bicarbonate is soluble in water, thus it dissolves.
hope it will help u...

Answer 2

when CO2 reacts with limewater it forms calciumcarbonate which has milky appearance and insoluble in water....... but when excess of CO2 is passed it reacts with calciumcarbonate and forms calciumbicarbonate which is soluble in water........that's why the milkiness disappears