GCEChemistryAcids, Bases and Salts2022

Which indicator would be most suitable for a titration involving a weak acid and a strong base?

AMethyl orange
BLitmus
CPhenolphthaleinCORRECT
DScreened methyl orange
AI
Toaster Teacher
Why the answer is C, and why the others tempt you.
For a weak acid–strong base titration, the equivalence point lies in the alkaline region (pH > 7). Phenolphthalein changes colour between pH 8.3 and 10.0, which coincides with this equivalence point. Methyl orange is suitable for strong acid–strong base or strong acid–weak base titrations.
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