MCQ
The $pH$ indicators are
- ASalts of strong acids and strong bases
- BSalts of weak acids and weak bases
- ✓Either weak acids or weak bases
- DEither strong acids or strong bases
✓
Answer
Correct option: C.
Either weak acids or weak bases
c
A useful indicator has a strong color that changes quickly near its $pK_a$. These traits are desirable, so only a small amount of an indicator is needed. If a large amount of strong acid or base is used, the indicator will affect the final $pH$, lowering the accuracy of the experiment. The indicator should also have a $pK_a$ value near the $pH$ of the titration end point.
A useful indicator has a strong color that changes quickly near its $pK_a$. These traits are desirable, so only a small amount of an indicator is needed. If a large amount of strong acid or base is used, the indicator will affect the final $pH$, lowering the accuracy of the experiment. The indicator should also have a $pK_a$ value near the $pH$ of the titration end point.
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