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0.01M $K M n O_{4}$ solution was added to 20.0 ml of 0.05M Mohr’s salt solution through a burette. The initial reading of 50ml burette is zero. The volume of $K M n O_{4}$ solution left in the burette after the end point is ______ml. (nearest integer)

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answer is 30.

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Detailed Solution

$M_{e q}$ of $K M n O_{4} = M_{e q}$ of Mohr’s salt
$0.01 \times 20 \times 5 = 0.05 \times V \times 1$
Volume needed = 20 ml
Initial volume of $K M n O_{4}$ in burette is 50ml
Thus, vol of $K M n O_{4}$ left in the burette
After end point = 30ml

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