For the titration between oxalic acid and sodium hydroxide, the indicator used is

Potassium permanganate

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Phenolphthalein

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Litmus

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Methyl orange

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Solution

The correct option is A Phenolphthalein
Oxalic acid is titrated against NaOH. Phenolphthalein is chosen because it changes color in a pH range between 8 – 10. It appears pink in basic solutions and colourless in acidic solutions.
In the case of a strong acid-strong base titration, this pH transition would take place within a fraction of a drop of actual neutralization, since the strength of the base is high.

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