Question

The no. Of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is.......

Answer 1

Balance the equations:

Oxidise Sulfite:
_ SO3{2-} + _ H2O = _ SO4{2-} + _ H{+} + _ e{-}

Reduce Permanganate in acid:
_ KMnO4 + _ H{+} + _ e{-} = _ K{+} + _ Mn{2+} + _ H2O

Combine the half equations:
_ KMnO4 + _ H2SO3 = _ K2SO4 + _ MnSO4 + _ H2SO4 + _ H2O

Answer 2

2/5