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 form in basic medium. The compound 'X' is
A
Methyl red
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B
Phenolphthalein
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C
Erichrome Black T
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D
Methyl orange
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Solution
The correct option is B Phenolphthalein Phenolphthalein is a weak acid give colour in basic medium.
It turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.