Chemistry
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite.
Practical Chemistry
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Answer
When dil. sulphuric acid is added to sodium sulphide and heated, hydrogen sulphide gas is evolved which has the smell of rotten eggs.
Na2S + H2SO4 ⟶ Na2SO4 + H2S ↑
On adding dilute sulphuric acid to sodium sulphite and warming, a colourless gas with suffocating smell of burning sulphur is evolved. The evolved gas turns lime water milky and changes the colour of acidified K2Cr2O7 solution from orange to green suggesting that it is SO2.
Na2SO3 + H2SO4 (dil.) ⟶ Na2SO4 + H2O + SO2↑
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