Question

lime water turns milky when carbon dioxide gas is passed through it and further turns colourless when excess of carbon dioxide is bubbled through it . explain​

Answer 1

${\red{\huge{\bf{Hey!!}}}}$

This is because when excess amount of carbon dioxide is passed it forms calcium carbonate.

Answer 2

In presence of CO2, CaCO3 is produced which is milky. ... When carbon dioxide is passed through lime water it turns milky due to the formation of water insoluble precipitate CaCO3. Still if excess of CO2 is passed it forms water soluble Calcium bicarbonate . Thus the solution remains clear.