MCQ
Equal volumes of two solutions of $pH = 3$ and $pH = 5$ are mixed. The resultant $pH$ is
- A$8$
- B$2$
- ✓$3.3$
- D$4$
✓
Answer
Correct option: C.
$3.3$
c
$\left[\mathrm{H}^{+}\right]_{\operatorname{mix}}=\frac{10^{-3} \times \mathrm{v}+10^{-5} \times \mathrm{v}}{2 \mathrm{v}}=5.05 \times 10^{-4} \,\mathrm{M}$
$\left[\mathrm{H}^{+}\right]_{\operatorname{mix}}=\frac{10^{-3} \times \mathrm{v}+10^{-5} \times \mathrm{v}}{2 \mathrm{v}}=5.05 \times 10^{-4} \,\mathrm{M}$
$\because \mathrm{pH}=4-0.7=3.3$
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