Redox and Equivalent ConceptHard

Question

How many grams of oxalic acid crystals, H2C2O4⋅2H2O is needed to react completely with 100 ml of 0.4 M-KMnO4 in the presence of H2SO4?

Options

A.2.52 g
B.12.6 g
C.25.2 g
D.9.0 g

Solution

$n_{eq}H_{2}C_{2}O_{4}.H_{2}O = n_{eq}KMnO_{4}$

Or $\frac{w}{126} \times 2 = \frac{100 \times 0.4}{1000} \times 5 \Rightarrow w = 12.6\text{ g}$

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