Question

why carbon dioxideturns lime water milky what happens when excess of carbon dioxide is passes and why

Answer 1

When CO2 is passed through lime water , the lime water turns milky white due to formation of white precipitate of calcium carbonate.

Ca(OH)2 (aq) +CO2 -----> CaCO3 (s) +H2O(l)

If excess of Carbon dioxide is passed through lime water, then the white precipitate formed dissolves due to formation of a soluble salt calcium

hydrogencarbonate and the solution becomes clear again.

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

Answer 2

Answer:

CO2 turns lime water milky due to the appearance of  CaCO3.

Ca(OH)2 + CO2 = CaCO3 + H20

When excess CO2 is passed,

CaCO3 + H20 + CO2 = Ca(HCO3)2

Ca(HCO3)2 is colourless

Explanation: