1.6 g of pyrolusite ore was treated with 50 cm3 of 1.0 N oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to 250 cm3 in a flask. 25 cm3 of this solution when titrated with 0.1 N KMnO4 required 32 cm3 of the solution. Find the percentage of pure MnO2 in the sample and also the percentage of available oxygen.
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Answer:
Explanation:
Equivalent of 25ml = 3.2
Equivalent of 250 ml = 32
Equivalent of oxalic acid = 50
Equivalent of mno2 = 18
Moles×2000=18
Moles=0.009
Weight = 0.783
Percentage purity = 48.9375
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