MCQ
Addition of water to this solution will not change $[\mathrm{H}_3 \mathrm{O}^{+}]$.
- AChemical $\ce{pH}$ indicator.
- ✓Acid/ base buffer.
- CAnhydrous solution.
- DHypotonic solution.
✓
Answer
Correct option: B.
Acid/ base buffer.
Addition of water to $X$ solution does not change the $\ce{pH}$ of the solution, which means the concentration of the species present changes in such a way that the $\ce{pH}$ remains the same. This is possible for acid/base buffer.
$\text{pH}=\text{pk}_\text{a}+\log\frac{[\text{acid}]}{[\text{salt}]}$
Since the volume changes the same for both salt and acid, the ratio $\frac{\text{[salt]}}{\text{[acid]}}$remains the same and hence $\ce{pH}$ also remains the same. Same in the case of basic buffer solution.
$\text{pH}=\text{pk}_\text{a}+\log\frac{[\text{acid}]}{[\text{salt}]}$
Since the volume changes the same for both salt and acid, the ratio $\frac{\text{[salt]}}{\text{[acid]}}$remains the same and hence $\ce{pH}$ also remains the same. Same in the case of basic buffer solution.
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