MCQ
Which of the following solutions will have $pH$ close to $1.0$
  • A
    $100\,\,ml$ of $\frac{M}{{10}}HCl + 100\,\,ml$ of $\frac{M}{{10}}NaOH$
  • B
    $55\,\,ml$ of $\frac{M}{{10}}HCl + 45\,\,ml$ of $\frac{M}{{10}}NaOH$
  • C
    $10\,\,ml$ of $\frac{M}{{10}}HCl + 90\,\,ml$ of $\frac{M}{{10}}NaOH$
  • $75\,\,ml$ of $\frac{M}{5}HCl + 25\,\,ml$ of $\frac{M}{5}NaOH$

Answer

Correct option: D.
$75\,\,ml$ of $\frac{M}{5}HCl + 25\,\,ml$ of $\frac{M}{5}NaOH$
(d) M.eq. of $HCl = \frac{1}{5} \times 75 = 15$

M.eq. of $NaOH = 25 \times \frac{1}{5} = 5$

Total No. of eq.$ = 15 - 5 = 10$

Total volume $= 100$

Normality $ = \frac{{10}}{{100}} = \frac{1}{{10}},\,\,[{H^ + }] = {10^{ - 1}}$ $M$

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