Oxidation Test - Sulphur

Sulphur can as well be tested by oxidation test. The organic compound is fused along with fusion mixture (a mixture of sodium carbonate and potassium nitrate). The sulphur, if available in the organic compound, is oxidised to sodium sulphate. Na₂CO₃+S+3O → Na₂SO₄ + CO₂. The fused mass that is dissolved in water and the solution is acidified along with hydrochloric acid. After that Barium chloride solution is included. The formation of a white precipitate depicts the existence of sulphur. 

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl