Phenolphthalein cannot be used in the titration of

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HCI with NaOH

CH₃COOH with NaOH

HCI with NH₄OH

CH₃COOH with NH₄OH

answer is C.

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Detailed Solution

Phenolphthalein indicator distinguishes the pH change between pH 8 to 10. Therefore, it is used for strong acid and strong base titrations or weak acid and strong base titrations. In the given options, HCl and NH₄OH is a strong acid and weak base respectively, therefore in this titration, phenolphthalein is useless as an indicator.

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