Question

$1cc$ of $0.1N$ $HCl$ is added to $1$ litre solution of sodium chloride. The $pH$ of the resulting solution will be:

• A. 7
• B. 0
• C. 10
• D. 4

Answer 1

The correct option is D 4

Volume of HCl$=1c{m}^3$ or 0.001 L

Normality of HCl=0.1 N

Number of gram equivalents of HCl=Normality $\times$Volume

=${10}^{-3}\times {10}^{-1}$

= $10^{-4}$g eq.

So,

[$H^{+}$] =$10^{-4}$

$P_H=-\log {10}^{-4}$

$P_H=4$

Note: There will be no effect of NaCl solution because no. of H+ ion will remain the same.

Hence, the correct option is D.