pH change from 9 to 6, the H ion concentration will

A. Increase 100 times

B. Increase by 1,000 times

C. Decrease by 1,000 times

D. No net change

Answer: Option B

Solution(By Examveda Team)

pH is changing from 9 to 6 means moving from basicity to acidity level. Therefore, the concentration of H⁺ ion will increase 1,000 times.
The H⁺ concentration of pH 9 is 10^-9 mol/l while that of pH 6, the H⁺ ions will be 10^-6, hence increase of 10^-3 hydrogen ions i.e. 1,000 ions can be observed.