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5.5g of a mixture of FeSO4.7H2O and Fe2(SO4)3.9H2O required 5.4ml of 0.1 N KMnO4, solution for complete oxidation. Calculate mole of hydrated ferric sulphate in mixture

6 years ago


Answers : (1)


only FeSO4. 7H2O can be oxidysed since fe is in +2 oxidation state. hence milliqequivalents of kmno4 used = millieq of green vitriol

let wt in gram of ferroussulphate ( hydrated) be x

( x divided by 278) * 1000= 5.4 *0.1


x can be calculated by this

ans- (5.5 -x )/ (molecular wt of hydrated ferric sulphate)

6 years ago

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