What happens when:
$(i)$ $C O_{2}$ is passed through lime water in a limited amount.
$(i i)$ $C O_{2}$ is passed through lime water in excess.

Open in App

Solution

The reaction of $C O_{2}$ and limewater $(C a {(O H)}_{2})$ :
$(i)$
When $C O_{2}$ reacts with limewater $(C a {(O H)}_{2})$ , it forms the white precipitate of Calcium carbonate $(C a C O_{3})$ which is actually chalk and turns the solution color milky.
$\underset{(C a r b o n d i o x i d e)}{C O_{2} (g)} + \underset{(C a l c i u m H y d r a o x i d e)}{C a {(O H)}_{2} (s)} \to \underset{(C a l c i u m C a r b o n a t e)}{C a C O_{3} (s)} + \underset{(W a t e r)}{H_{2} O (l)}$
$(i i)$
When $C O_{2}$ reacts to the limewater $(C a {(O H)}_{2})$ in excess it forms Calcium bicarbonate $C a {(H C O_{3})}_{2}$ which is colorless. So, the milkiness of the solution disappears.
$\underset{(C a l c i u m c a r b o n a t e)}{C a C O_{3} (s)} + \underset{(C a r b o n d i o x i d e)}{C O_{2} (g)} + \underset{(W a t e r)}{H_{2} O (l)} \to \underset{(C a l c i u m b i c a r b o n a t e)}{C a {(H C O_{3})}_{2} (s)}$

Suggest Corrections

Similar questions

C O_{2}

What happens when CO2 is passed through lime water?

CO2 gas is passed through lime water. Write the chemical equation to show the change.

a) What happens if excess of CO2 is passed through lime water?

b) What is the product formed?

c) How will you represent the reaction?

Join BYJU'S Learning Program