Question

The pH of a solution is increased from 3 to 6. Its $H^{+}$ ion concentration will be:

• A. reduced to half
• B. doubled
• C. reduced by 1000 times
• D. incresed by 1000 times

Answer 1

The correct option is C reduced by 1000 times

Change in pH is $\Delta pH=p{H}_2-p{H}_1=6-3=3$.

Thus, the ratio of hydrogen ion concentration is $\frac{[H^{+}{]}_2}{[H^{+}{]}_1}={10}^{-3}=0.001$.

Hence, hydrogen ion concentration should be decreased by 1000 times.

Option C is correct.