A) thymol blue
B) methyl orange
C) phenolphthalein
D) fluorescein
Correct Answer: B
Solution :
Key Idea: The indicators show change in colour with change in \[pH\]. The indicator used should be such that it shows colour change in the same pH range as required around equivalence point. In titration of weak base and strong acid, the pH change lies between 6 to 4.Indicator | pH range |
Thymol blue | \[9.3-10.5\] |
Methyl orange | \[4.2-6.2\] |
Phenolphthalein | \[8.3-10.0\] |
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