Question

What would be a better indicator for a titration HC2H​3O2​ with NaOH; Methyl Red or Phenolphthalein?...

What would be a better indicator for a titration HC2H​3O2​ with NaOH; Methyl Red or Phenolphthalein?

​I feel like its phenolphthalien since NaOH is a strong base and HC2​H3​O​2 is a weak acid, but I just want to verify.

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Answer #1

At equivalence point, equal proportions of acid and base or mixed. The purpose of an indicator is to identify the equivalence point where there is change in color. A weak acid ( CH3COOH) will react with a strong base ( NaOH) to form a basic (pH > 7) solution.

Phenolphthalein is colourless below pH 8.5 and changes pink to deep red hue above pH 9.0 , the equivalence point of titration.

it has a strong color and the change from colorless to pink makes it easy to detect during titrations.

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