Question
Chemistry Question on Acids and Bases
Incorrect statement for the use of indicators in acid-base titration is :
A
Methyl orange may be used for a weak acid vs weak base titration.
B
Phenolphthalein may be used for a strong acid vs strong base titration.
C
Methyl orange is a suitable indicator for a strong acid vs weak base titration.
D
Phenolphthalein is a suitable indicator for a weak acid vs strong base titration.
Answer
Methyl orange may be used for a weak acid vs weak base titration.
Explanation
Solution
| Indicator | pH range |
|---|---|
| Methyl orange | 3.2 - 4.5 |
| Phenolpthalein | 8.3 - 10.5 |
Methyl orange may be used for a strong acid vs strong base and strong acid vs weak base titration. Phenolpthalein may be used for a strong acid vs strong base and weak acid vs strong base titration
So , the correct option is (A) : Methyl orange may be used for a weak acid vs weak base titration.