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Sulphur disappears when boiled with an...

Sulphur disappears when boiled with an aqueous solution of `Na_(2)SO_(3)` - Why ?

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Sulphur reacts with `Na_(2)SO_(3)` to form water soluble sodium thiosplhate .
`Na_(2)SO_(3) + S to Na_(2)S_(2)O_(3)`
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