Question on: JAMB Chemistry - 2024
The indicator used in a titration between strong acid and weak base is
A
methyl orange
B
phenolphthalein
C
bromothymol blue
D
methyl red
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Correct Option: A
In a strong acid-weak base titration, the equivalence point is acidic. Suitable indicators are:
- Methyl orange: pH 3.1-4.4, red to yellow, suitable.
- Phenolphthalein: pH 8.3-10, not suitable.
- Bromothymol blue: pH 6.0-7.6, near neutral, less suitable.
- Methyl red: pH 4.4-6.2, also suitable, though methyl orange is preferred.
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