Question

$1ml$ of $0.1NHCl$ 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

Answer: (D)

4

Since $NaCl$ is a salt that is neutral in nature so it will not effect the $pH$ of solution,

So, $H^{+}=\frac{N_1{V}_1}{V_{solution}}=\frac{0.1\times {10}^{-3}}{1.001}M\approx {10}^{-4}M$

$pH=-log\left[H^{+}\right]=-log\left({10}^{-4}\right)=4$