A solution has pH = 5, it is diluted 100 times, then it will beco…

MCQ

A solution has pH = $5$, it is diluted $100$ times, then it will become ……………….

✓
Neutral
B
Basic
C
unaffected
D
more acidic

✓

Answer

Correct option: A.

Neutral

$(a)$ Neutral
$pH =5$ means $\left[ H ^{+}\right]=10^{-5}$
After dilution $\left[ H ^{+}\right]=10^{-5} / 100=10^{-7} M$
$\left[ H ^{+}\right]$from $H _2 O$ cannot be neglected.
Total $\left[ H ^{+}\right]=10^{-7}+10^{-7}=2 \times 10^{-7}$
$pH =7-0.3010=6.6990=7$
$pH =7 \text { (Neutral) }$

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