Question

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.
(b) What happens when carbon dioxide gas is passed through lime water
(i) for a short time?
(ii) for a considerable time?
Write equations of the reactions involved.

Answer 1

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Answer 2

After Certain Time - Whiteness Disappears

Explanation:

On passing $CO_2$ through $(Ca(OH)_2)$ lime water

(i) In a very short duration of time, it turns the Lime Water into a white ppt (Milky) because of calcium carbonate formation.

$Ca(OH)_2 (aq) + CO_2 (gas) --> CaCO_3 (s) + H_2O (l)$

Calcium Hydroxide (Lime Water) + Carbon di-oxide Gives Calcium Carbonate (Makes Lime Water Milky - White ppt) + Water

(ii) for a considerable time, the whiteness of the lime water disappears and it becomes clear again due to the formation of carbonic acid.

$CaCO_3 (s) + CO_2 (g) + H_2O (l) --> CaHCO_3$