Question

Find the volume of strength of $H_2{O}_2$ solutions prepared by mixing of 250 mL of 3 N $H_2{O}_2$ and 750 mL of 1 N $H_2{O}_2$ solution :-

• A. 1.5 V
• B. 8.4 V
• C. 5.6 V
• D. 11.2 V

Answer 1

The correct option is B 8.4 V

Normality of total solution is given by :

$N_1{V}_1+N_2{V}_2=N_f(V_1+V_2)$

$(250\times 3)+(750\times 1)=N_f(250+750)$

$750+750=N_f\left(1000\right)$

$N_f=\frac{1500}{1000}$ = $1.5$

Volume strength of $H_2{O}_2=11.2\times M$

In terms of normality,$N=M\times n$

n factor for $H_2{O}_2$ is 2

$N=M\times 2$ and $M=\frac{N}{2}$

Volume strength =$11.2\times \frac{N}{2}$ = $5.6N$= $5.6\times Normality$

Volume strength of $H_2{O}_2$ = $5.6\times 1.5$ = $8.4V$

Hence, option B is correct .