MCQ
${10^{ - 6}}\,M\,\,HCl$ is diluted to $100$ times. Its $pH$ is
- A$6$
- B$8$
- ✓$6.95$
- D$9.5$
✓
Answer
Correct option: C.
$6.95$
(c) ${10^{ - 6}}\,M\,HCl = {10^{ - 8}}M\,[{H^ + }]$. Also from ${H_2}O$
$[{H^ + }] = {10^{ - 7}}\,M$
Total $[{H^ + }] = {10^{ - 7}} + {10^{ - 8}} = {10^{ - 7}}[1 + 0.1]$$ = {10^{ - 7}}[1.1]$
Hence $pH = 7 - 0.0414 = 6.96$.
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