Question:-
Which indicator is used in the titration of the weak acid-weak base?
The options are...
- A. Phenolphthalein
- B. Methyl orange
- C. Bromothymol blue
- D. No indicator is suitable
The correct answer is D: No indicator is suitable for this titration since it requires a vertical portion of the curve over two pH units.
Explanation:
The vertical component of the titration curve when titrating a weak acid with a weak base is so short that it's difficult to find an indicator that will change colors in this small region, therefore a pH meter could be used to determine the endpoint.
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