Question

what happen when:-
(a) Limited supply of Co2 is passed through lime water
(b) Co2 is passed through lime water in excess

Answer 1

Ca(OH)2 + CO2 gives calcium carbonate and water
calcium carbonate pls water plus co2 give calcium hydrogen carbonate which is soluble in water and the solution turns colourless
in the first case since calcium carbonate is formed it turns the sol. milky

Answer 2

Answer:

a) When the limited supply of Co2 is passed through lime water- it reacts and forms calcium carbonate which is insoluble in water and thereby the solution becomes turbid or forms a milky white precipitate.

The reaction is given as: Ca(OH)2(aq) + CO2(g) -----> CaCO3(s) + H2O

(b) When Co2 is passed through lime water in excess, the turbidity disappears as calcium bicarbonate gets formed which is soluble in water and hence a clear solution is observed.

The reaction is given as: CaCO3(s) + H2O(l) + CO2(g) ------> Ca(HCO3)2(aq).