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Physical Properties

The purity of...

Question

The purity of H2O2 in a given sample is 85% . What is the weight of the impure sample of H2O2 which requires 10 ml of 1 N KMNO4 in a titration in acidic medium.

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Solution

In titration:
$M_{e q} H_{2} O_{2} = M_{e q} K M n O_{4} I f w i s t h e m a s s o f s a m p l e o f H_{2} O_{2}, t h e n : \frac{w}{34 / 2} x 1000 = 10 x 1 (e q u i v a l e n t m a s s H_{2} O_{2} = m o l a r m a s s / 2 = 34 / 2) w = 0.17 g$

Mass of 100% pure H₂O₂ required = 0.17 g
Mass of 85% pure H₂O₂ required = 0.17 x (100/85)
= 0.2 g

Thus, weight of impure sample of H₂O₂ = 0.2 g

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