1.6 g of pyrolusite was treated with 60 mL of normal oxalic acid and some H_(2)SO_(4). The oxalic acid left undecomposed was made up to 250 mL, 25 mL of this solution required 32 mL of 0.1 N potassium permangante (KMnO_(4)). Calcualte the percentage of pure MnO_(2) in pyrolusite.

1.6 g of pyrolusite was treated with 60 mL of normal oxalic acid and s

1.	1.6 g of pyrolusite was treated with 60 mL of normal oxalic acid and some H_(2)SO_(4). The oxalic acid left undecomposed was made up to 250 mL, 25 mL of this solution required 32 mL of 0.1 N potassium permangante (KMnO_(4)). Calcualte the percentage of pure MnO_(2) in pyrolusite.
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