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25 grams of a sample of ferrous sulphate...

`25 grams` of a sample of ferrous sulphate is dissolved in dilute sulphuric acd. By adding water, its volume is made up to 1 litre.` 25 mL` of this solution requries `20 mL` of `N//10 KMnO_(4)` solution for oxidation. Calculate the percentage of `FeSO_(4) . 7H_(2)O` in the sample.
Strategy: Percentage of `FeSO_(4).7H_(2)O`
`=("mass"_("ferrous sulphate"))/("mass of sample")xx100%`
To get the mass of ferrous suphate, we need to calculate equivalents of ferrous sulphate. By law of equivalrnce, the milli equivalents of `KMnO_(4)` must be equal to the miliequivalents of ferrous sulphate. We can find the milliequivalents of `KMnO_(4)` by taking the product of millilitres of solution and its normality.

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