First slide

Redox titrations

Question

200 ml of Ferrous sulphate solution reduces 100 ml of 0.02M potassium permanganate solution in acidic medium. Molarity of Ferrous sulphate solution is

Moderate

A

0.2M
B

0.05M
C

0.4M
D

0.1M

Solution

${Fe}^{+ 2} \to {Fe}^{+ 3}; + 2 + 3 Increase in ox . state / mole = 1 (valency); {MnO}_{4}^{-} \to {Mn}^{+ 2} + 7 + 2 Decrease in ox . state / mole = 5 (valency); V_{1} N_{1} ({FeSO}_{4}) = V_{2} N_{2} ({KMnO}_{4}); 200 \times M_{1} \times 1 = 100 \times 0.02 \times 5; M_{1} = 0.05 M$

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