Question

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

• A. Reduced to half
• B. Doubled
• C. Reduced by $1000$ times
• D. Increased by $1000$ times

Answer 1

The correct option is C Reduced by $1000$ times

As we kniow, $pH=-log\left[H^{+}\right]$

Here, $3=-\log \left[H^{+}\right]$
$[H^{+}{]}_1={10}^{-3}M$

For pH = 6, $[H^{+}{]}_2={10}^{-6}M$

So, here hydrogen ion conc. reduces by $1000=\frac{{10}^{-6}}{{10}^{-3}}={10}^{-3}$ times.