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Question

100 mL of 0.1 nhypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of Kl.The value of x is:

A
5.0 g
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B
1.25 g
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C
2.5 g
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D
4 g
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Solution

The correct option is C 2.5 g
100 ml of 0.1 hypo (Na2S2O3) = 100 ml of 0.1 N (Normality) CuSO4.5H2O = 249.5×0.1)/(1000) ×100=2.5g

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