Question

0.1M HCl solution is diluted by 100 times The pH of the solution is:

• A. 3
• B. 2
• C. 4
• D. 6

Answer 1

The correct option is A 3

When 0.1 M HCl solution is diluted 100 times, the molarity of solution will be $\frac{0.1}{100}=0.001M$.

HCl is strong electrolyte. It completely dissociates.

Its hydrogen ion concentration will be 0.001 M.

The pH of the solution will be $-log\left[H^{+}\right]=-log\left(0.001\right)=3$.

Option A is correct.