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

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

JIPMERJIPMER 2003

Solution:

$pH$ 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.