Saturday, June 11, 2022

Which indicator is used in the titration of a weak acid and strong base?

Question:-

Which indicator is used in the titration of a weak acid and strong base?
The option are...
  • A. Methyl orange
  • B. Phenolphthalein
  • C. Bromothymol blue
  • D. Thymolphthalein

The correct answer is B: Phenolphthalein indicator is suitable in the titration of a weak acid and strong base titration as it changes sharply at the equivalence point.


Explanation:

The pH value at the weak acid-strong base equivalence point will be on the basic side. The pH range of phenolphthalein (8-10) also falls within this basic range, making it suited for titration.

Phenolphthalein is a weak organic acid that turns pink from colorless when the concentration of OH- ions increases, indicating the endpoint.


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