NEET 2026 Chemistry question
Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline pH close to the equivalence point during this titration is:
Answer: (4)
Solution
Phenolphthalein is colourless in acidic and neutral solution and turns pink in the pH range of about 8.3-10. In the oxalic acid-NaOH titration (strong base vs weak acid) the equivalence point lies in the alkaline region (pH about 8-9), so phenolphthalein is a suitable indicator. In the flask the solution is
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