Question

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

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

Answer 1

The correct option is B $8.4V$

$N_1{V}_1+N_2{V}_2+...N_n{V}_n=N_x{V}_x$
$3\times 0.25+1\times 0.75=N_x\times (250+750)$
$N_x=1.5N$
$1.5N{H}_2{O}_2=0.75M{H}_2{O}_2$
$1$ litre of the solution contains $25.5$ g $H_2{O}_2$ ($0.75\times 34$).
According to the equation,
$2H_2{O}_2⟶2H_{2}O+O_2$
$68$ g $H_2{O}_2$ gives $22.4$ litre $O_2$.
$25.5$ g $H_2{O}_2$ gives $8.4$ litres.
Therefore, the volume strength of $1.5H_2{O}_2$ is $8.4V$.