Question
Sulphur disappears when boiled with sodium sulphite. Why?
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Answer
When sodium sulphite is heated with sulphur, we get sodium thiosulphate which is soluble in water that is why sulphur disappears.
$\text{Na}_2\text{SO}_3+\text{S}\xrightarrow{\ \ \text{Heat}\ \ }\text{Na}_2\text{S}_2\text{O}_3$
$\text{Na}_2\text{SO}_3+\text{S}\xrightarrow{\ \ \text{Heat}\ \ }\text{Na}_2\text{S}_2\text{O}_3$
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