Question

1)Sodium thiosulfate is used to remove excess Cl2 from chlorine-bleached fabrics. The thiosulfate ion forms SO42− and elemental sulfur, while Cl2 is reduced to Cl−.

Express your answer as a chemical equation including phases.

2) An aqueous solution of SO2 reduces aqueous KMnO4 to MnSO4(aq). Write balanced equation for this reaction.

3)An aqueous solution of SO2 reduces acidic aqueous Cr2O72− to aqueous Cr3+. Write balanced equation for this reaction.

Answer 1

Ans 1 :

Sodium thiosulfate is Na₂S₂O₃. When ir reduces Cl2 to Cl^- , it itself gets converted into NaHSO₄.

So the chemical equation is given as :

Na₂S₂O₃ (aq)+ 4Cl₂ (g) + 5H₂O = 2NaHSO₄ (aq) + 8HCl (aq)