Question

Co2 is passed through lime water first in small amounts and then in excess​

Answer 1

Answer:

CO2 +Ca(OH)2===CaCO3+H2O

Answer 2

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) I hope this will help you