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Chemistry Question on Acids and Bases

A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH3COOH. Compound 'X' exists in ionized from in basic medium. The compound 'X' is

A

Methyl orange

B

Methyl red

C

Phenolphthalein

D

Eriochrome Black T

Answer

Phenolphthalein

Explanation

Solution

A compound X is a weak acid and it exhibits colour change at pH

In basic medium,
[H⨁] decreases and therefore more of (Ph⊖) is produced.

A compound X is a weak acid and it exhibits colour change at pH

So, the correct option is (C): Phenolphthalein.