Multiple choice

Which of the following indicators should be used for titration of NH4OH with HCl solutions?

  1. Methyl orange

  2. Phenolphthalein

  3. Thymol blue

  4. Alizarin yellow
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A Correct answer
Explanation

Titration of NH4OH (weak base) with HCl (strong acid) solution results in acidic solution at equivalence point. Hence, methyl orange can be used as indicator which changes colour in pH range of 3.1 to 4.4.

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