Distinguish between Sodium sulphate and sodium sulphite

1.	Distinguish between Sodium sulphate and sodium sulphite
Answer» Sodium sulphate is dissolved in water and barium chloride solution is added, an insoluble white precipitate of barium sulphate is obtained. Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl(White ppt) Sodium sulphite is warmed with dilute sulphuric acid, a colourless gas with a pungent and suffocating smell is evolved. When this gas is bubbled through acidified solution of potassium dichromate, it turns its colour from orange to green. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂ K₂Cr₂O₇ + H₂SO₄ + 3SO₂ → K₂SO₄+ Cr₂(SO₄)₃ + H₂O

Answer»

Sodium sulphate is dissolved in water and barium chloride solution is added, an insoluble white precipitate of barium sulphate is obtained.

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl(White ppt)

Sodium sulphite is warmed with dilute sulphuric acid, a colourless gas with a pungent and suffocating smell is evolved. When this gas is bubbled through acidified solution of potassium dichromate, it turns its colour from orange to green.

Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂

K₂Cr₂O₇ + H₂SO₄ + 3SO₂ → K₂SO₄+ Cr₂(SO₄)₃ + H₂O

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