Refer to Example 5-6. Assume that the only reducing agent present in a particular wastewater is SO₃^2-. If a 25.00 mL sample of this wastewater requires 31.46 mL of 0.02237 M KMnO₄ for its titration, what is the molarity of SO₃^2- in the wastewater?

Example 5-6

The reaction described by expression (5.25) below is used to determine the sulfite ion concentration present in wastewater from a papermaking plant. Use the half-equation method to obtain a balanced equation for this reaction in an acidic solution.

SO₃^2-(aq) + MnO₄^-(aq) → SO₄^2-(aq) + Mn²⁺(aq)