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24/12/2021 1:04 pm
Topic starter
S1: Methyl orange is suitable indicator for titration of strong acid and weak base.
S2: Phenolphthalein is not suitable indicator for titration of acetic acid and NaOH.
(a) Both S1 and S2 are correct.
(b) S1 is correct but S2 is incorrect.
(c) S1 is incorrect but S2 is correct.
(d) Both S1 and S2 are incorrect.
1 Answer
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24/12/2021 1:05 pm
Correct answer: (b) S1 is correct but S2 is incorrect.
Explanation:
Methyl orange indicator is used in the strong acid weak base titration. Phenolphthalein changes colour at a pH above 7. So, it is quite good as an indicator for titrations of strong acids with strong bases. It is also suitable for titrations of weak acids and strong bases, which have an equivalence point at a pH above 7.