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.
You may also like this
No comments:
Post a Comment