Calculate the percentage !

Posted on 2014-01-27 17:20:00 in Chemistry by STUDENT_CHEM

1.0 g powdered pyrolusite(MnO₂) was boiled with 50 ml of  N oxalic acid and 50 ml of dilute H₂SO₄ when the reaction was complete the solution was cooled and diluted to 250ml. 20ml of this solution required 22.0 ml of 0.1 N KMnO₄ for titration. Calculate the percentage of MnO₂ in the sample and the available oxygen in it.

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