What is observed when sulphur dioxide is passed through ,water lime, water? Also write chemical equation for the reaction that takes place

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Solution

i) When $S O_{2}$ is passed through water, sulphurous acid is formed. The aqueous solution of $S O_{2}$ turns blue litmus red.

$S O_{2} + H_{2} O ⇌ H_{2} S O_{3}$

(ii) But when $S O_{2}$ is passed through lime water, calcium sulphite (white ppt.) is formed, which reacts with excess $S O_{2}$ to form calcium hydrogen sulphite.

The chemical equation for the reactions are:

$C a (O H)_{2} + S O_{2} = C a S O_{3} + H_{2} O$
$C a S O_{3} + S O_{2} + H_{2} O = C a (H S O_{3})_{2}$ .

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