Question

A solution of strong acid having pH = 6 is diluted to 10 times. The final pH is approximately.

• A. 5
• B. 7
• C. 8
• D. Slightly less than 7

Answer 1

The correct option is D Slightly less than 7

After dilution conc. of hydrogen ion = hydrogen ion from acid + hydrogen ion from water $={10}^{-7}+{10}^{-7}=2\ast {10}^{-7}$

so pH of solution is

pH = -log [H] = slightly less than 7.