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Question

A solution of Na2S2O3 is standarised iodometrically against 0.167 gram of KBrO3. This process requires 50 mL of the Na2S2O3 solution. What would be the normality of the Na2S2O3 solution?
(Molar mass of KBrO3 is 167 g/mol)

A
0.2 N
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B
0.12 N
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C
0.72 N
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D
0.02 N
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Solution

The correct option is B 0.12 N
The required reaction is:
K+5BrO3+Na2S2O3K1Br+Na2SO4+H2SO4
Here the change in oxidation state of Br is 6.
n - factor =6
Equivalent weight of KBrO3=1676

NNa2S2O3=0.167167×6×100050=0.12 N

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