Write the balanced chemical equation.
(i) Sodium thiosulphate is reacted with dilute hydrochloric acid.

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Solution

The balanced chemical equation for the reaction between sodium thiosulphate and dilute hydrochloric acid is:
$N a_{2} S_{2} O_{3} + 2 H C l \to 2 N a C l + H_{2} O + S O_{2} + S$

Hydrochloric acid reacts with thiosulphates to produce sulphur dioxide gas and a yellow precipitate of sulphur.

This reaction distinguishes between thiosulphates and sulphites as sulphur is not precipitated when sulphites are treated with dilute hydrochloric acid.

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