Question

The $pH$ of a solution is $5.0$. If $H ^{+}$ion concentration is decreased $100$ times. Then the solution will be:

• A. neutral
• B. more acidic
• C. basic
• D. of the same acidity

Answer 1

Answer: (A)

neutral

Answer 2

$pH$ of the solution $=5$
$\left[ H ^{+}\right]=10^{-5} M$
On decreasing the $H ^{+}$ion concentration $100$ times the $\left[ H ^{+}\right]$becomes
$=\frac{10^{-5}}{100}=10^{-7} M$
Now $pH =7$, which signifies a neutral solution.
So, the correct option is (A): neutral.