Question

When co2 passed through lime water:

Answer 1

Answer:

When CO2 is passed through lime water lime water turns milky  due to the formation of calcium carbonate CaCO3.

Answer 2

$\huge \underline \mathbb \pink {ANSWER}$

a) When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.

The reaction is-

Ca(OH)2 + CO2 CaCO3 + H2O

b) When carbon dioxide gas is passed through lime water for a considerable time ,then the white precipitate of calcium carbonate which is fomed initially as shown in the above reaction ,dissolves due to formation of a soluble salt calcium hydrogen carbonate and the solution becomes clear again.

The reaction is -

CaCO3 + CO2 + H2O = Ca(HCO3)2