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Hydrogen Peroxide

Excess of K...

Question

Excess of $K I$ and $d i l . H_{2} S O_{4}$ were mixed in $50 m L H_{2} O_{2}$ . The liberated $I_{2}$ required $20 m L$ of $0.1 N N a_{2} S_{2} O_{3}$ . Find out the strength of $H_{2} O_{2}$ in $g p e r l i t r e$ .

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Solution

$M_{e q}$ of $H_{2} O_{2}$ = $N \times 50$
$N ⟶$ Normality of $H_{2} O_{2}$

$M_{e q}$ of $N a_{2} S_{2} O_{3}$ = $0.1 \times 20$
$∴$ $M_{e q}$ of $H_{2} O_{2}$ = $M_{e q}$ of $N a_{2} S_{2} O_{3}$
$N \times 50 = 0.1 \times 20$
$∴$ $N = 0.04 N$

$∴$ Volume strength of $H_{2} O_{2}$ = $N \times 5.6$
= $0.04 \times 5.6$
= $0.224 g / L$

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