MCQ
$pH$ value of a solution, whose hydronium ion concentration is $6.2 \times {10^{ - 9}}\,mol/\,l,$ is
- A$6.21$
- B$7.21$
- C$7.75$
- ✓$8.21$
✓
Answer
Correct option: D.
$8.21$
(d) $[{H_3}{O^ + }]$ means $[{H^ + }] = 6.2 \times {10^{ - 9}}\,\,mol/l$
$pH = - \log \,(6.2 \times {10^{ - 9}}) = 8.21$
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