MCQ
A solution has $pH = 5$, it is diluted $100 $ times, then it will become
- ✓Neutral
- BBasic
- CUnaffected
- DMore acidic
✓
Answer
Correct option: A.
Neutral
(a) $pH = 5,$ means $[{H^ + }] = {10^{ - 5}}M.$
After dilution $[{H^ + }] = {10^{ - 5}}/100 = {10^{ - 7}}M$
$[{H^ + }]$ from ${H_2}O$ cannot be neglected.
Total $[{H^ + }] = {10^{ - 7}} + {10^{ - 7}} = 2 \times {10^{ - 7}}$
$pH = 7 - 0.3010 = 6.6990 = 7$(neutral).
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