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NEET2024ChemistryIonic EquilibriumActual

Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?

Options

  1. APhenolphthalein, pink to yellow
  2. BAlkaline KMnO ₄ , colourless to pink
  3. CPhenolphthalein, colourless to pink
  4. DMethyl orange, yellow to pinkish red colour

Correct answer

C. Phenolphthalein, colourless to pink

Step-by-step solution

For weak acid and strong base titration, phenolphthalein is used as indicator. In acidic medium phenolphthalein is colourless while in alkaline medium it is pink in colour.

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