The pH of the solution: 5 ;mL of M 5 ,HCl + 10 ;mL of M 10 ;NaOH … - Vidyadip

MCQ

The $pH$ of the solution: $5\;mL$ of $\frac{M}{5}$,$HCl + 10\;mL$ of $\frac{M}{{10}}\;NaOH$ is

A
$5$
B
$3$
✓
$7$
D
$8$

✓

Answer

Correct option: C.

$7$

(c) Milliequivalents of $HCl$ $ = 5 \times \frac{1}{5} = 1$

Milliequivalents of $NaOH$ $ = 10 \times \frac{1}{{10}} = 1$

$\therefore \;\;5ml\frac{M}{5}HCl = 10\,ml\frac{M}{5}HCl$

Hence the solution will be neutral i.e., $pH = 7$.

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