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32 g of a sample of FeSO4.7H2O were dissolved in dilute sulphuric acid and water and its volume was made up to 1 litre. 25 ml of this solution required 20 ml of 0.02 M KMnO4 solution for complete oxidation. Calculate the mass% of FeSO4.7H2O in the sample.

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answer is 00069.50.

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Detailed Solution

M-eq. of FeSO4.7H2O in 1 litre=20×0.02×5×100025=80∴W278×1×1000=80⇒W=22.24Mass & of FeSO4.7H2O in given sample=22.2432×100=69.5

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32 g of a sample of FeSO4.7H2O were dissolved in dilute sulphuric acid and water and its volume was made up to 1 litre. 25 ml of this solution required 20 ml of 0.02 M KMnO4 solution for complete oxidation. Calculate the mass% of FeSO4.7H2O in the sample.