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Question

25 mL$$ H_2O_2 $$ were added to excess of acidified solution of KI. The iodine so liberated required 20 mL of 0.1 N sodium thiosulphate for titration. Calculate the volume strength.

Solution
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Milliequivalents of $$Na_2​S_2​O_3$$ ​= 20×0.1 = 2
Milliequivalents of $$I_2 ​=2$$
Milliequivalents of $$KI = 2$$
Milliequivalents of $$H_2​O_2 ​= 2$$
Normality of $$H_2​O_2 ​=\frac{2}{25}$$​
For $$H_2​O_2$$​, 5.6× Normality = Volume strength
∴ Volume strength=$$\frac{2}{25}×5.6=0.448$$

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