pH value of a solution, whose hydronium ion concentration is 6.2 … - Vidyadip

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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