MCQ
Addition of water to this solution will not change [H3O+].
- AChemical pH indicator.
- BAcid/ base buffer.
- CAnhydrous solution.
- DHypotonic solution.
✓
Answer
- Acid/ base buffer.
Explanation:
Addition of water to X solution does not change the pH of the solution, which means the concentration of the species present changes in such a way that the 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 pH also remains the same. Same in the case of basic buffer solution.
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