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Question
Given below are two statements:
Statements I: In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II: For titration of acetic acid with NaOH, phenolphthalein is not a suitable indicator.
In light of the above statements, choose the most appropriate answer from the options given below:
Options
Statement I is true but statement II is false.
Both Statement I and statements II are false.
Statement I is false but statement II is true.
Both Statement I and statements II are true.
Solution
Statement I is true but statement II is false.
Explanation:
Statement (I) is true: The equivalency point in the titration of strong acid and a weak base is close to pH less than 5. Methyl orange has a pH range of 3.2 to 4.4 and can be used as an indicator in this type of titration.
Statement (II) is False: Phenophthalein's pH range is 8.5 to 10, making it a useful indicator for such titrations of a weak acid and strong base, where the equivalence point is close to around pH more than 8.
