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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper I

Q2(a). Weak-acid titration indicator

Question

Which indicator is employed in the titration of acetic acid with sodium hydroxide? Explain with suitable neutralization curve(s).

Answer in brief

Phenolphthalein is suitable because its transition range lies within the steep pH rise around the alkaline equivalence point.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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CoversWeak-acid titration indicatorAcid–base titration

All parts of Question 2