Question

The normality of solution obtained by mixing $10ml$ of $N/5HCl$ and $30ml$ of $N/10HCl$ is:

• A. $\frac{N}{15}$
• B. $\frac{N}{5}$
• C. $\frac{N}{7.5}$
• D. $\frac{N}{8}$

Answer 1

The correct option is D $\frac{N}{8}$

Normality of a mixture of two or more acids is given by
$N=\frac{N_1{V}_1+N_2{V}_2}{V_1+V_2}$
$=\frac{\frac{1}{5}\times 10+\frac{1}{10}\times 30}{10+30}=\frac{5}{40}=\frac{1}{8}$ or $\frac{N}{8}$