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A sample of pynolusite (MnO(2)) weights ...

A sample of pynolusite `(MnO_(2))` weights 0.5 gm. To this solutioin 0.594 gm `As_(2)O_(3)` and a dilute acid are added. After the reaction has stopped `As^(+3)` is `AS_(2)O_(3)` is titrated with 45 mlof M/50 `KMn_(4)` solution. Calculate the percentage of `MnO_(2)` in pyrolusite.

A

0.6225

B

0.68

C

0.673

D

0.666

Text Solution

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The correct Answer is:
A
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