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Question
State your observation when dilute hydrochloric acid is added to sodium thiosulphate.
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Solution
Thiosulphate and diluted hydrochloric acid combine to form sulphur dioxide, which precipitates yellow sulphur.
\[\ce{Na2S2O3 + 2HCl -> 2NaCl + H2O + SO2 + S ↓}\]
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