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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
The $pH$ indicators are
  • A
    Salts of strong acids and strong bases
  • B
    Salts of weak acids and weak bases
  • ✓
    Either weak acids or weak bases
  • D
    Either 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.

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