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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper III

Q3(c). Fully deprotonated fractions

Question

Give the highest-deprotonation alpha fraction in terms of acid dissociation constants and [H⁺] for tartrate, acetate, phosphate, nitrilotriacetic acid and EDTA.

Answer in brief

For an n-protic acid, the fully deprotonated fraction is the product of all Kᵢ divided by the protonation polynomial.

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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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Read the whole 2016 solution2016 question paper

CoversFully deprotonated fractionsPolyprotic equilibria

All parts of Question 3