Why does lime water turn milky when CO₂ is passed through it?

When CO₂ is passed through lime water, it reacts with it and changes the colour of the lime water milky due to the formation of calcium carbonate.

Chemical equation of this reaction is:

Calcium hydroxide (lime water) + Carbon dioxide -----------> Calcium carbonate + water

Ca(OH)₂ + CO₂ ---------> CaCO₃ + H₂O

Hope this helps u........... 

This is because of the formation of calcium carbonate which is milky.

Carbon dioxide (released during the reaction of ethanoic acid with sodium bicarbonate ) reacts with calcium hydroxide (lime water) to form calcium carbonate (white precipitate). The reaction of carbon dioxide gas with lime water is as follows:

Limewater turns milky due to reaction of CaO with CO2 forming CaCO3. CaCO3 is insoluble in Limewater and precipitates. But this milkyness disappears after we pass excess of CO2 since Calcium hydrogen Carbonate [ Ca(HCO3)2} is formed which is soluble in limewater.

When CO₂ is passed through lime water, it reacts with it and changes the colour of the lime water milky due to the formation of calcium carbonate.

Carbon dioxide (released during the reaction of ethanoic acid with sodium bicarbonate ) reacts with calcium hydroxide (lime water) to form calcium carbonate (white precipitate). The reaction of carbon dioxide gas with lime water.