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30/12/2021 2:14 pm
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Find the strength of KMnO4 in gm/L. If 10mL of KMnO4 requires 0.1 M FeSO4 of the same value for decolorisation.
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30/12/2021 2:17 pm
MnO4- + Fe2+ → Mn2+ + Fe3+
Vf = 5Vf = 1
Milli equivalents of MnO4- = Milli equivalents of Fe2+
5 × [M × 10] = 1 × [0.1 × 10]
M = 0.02 x mol/L
Strength of KMnO4 = Molarity × Molar mass
= (0.02 × 158) g/L = 3.16 g/L