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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 · 2021 · Mains Paper I

Q11(c). Why excessive precipitant is avoided

Question

A very large excess of the precipitating agent is avoided in quantitative analysis. Justify.

Answer in brief

A small excess promotes completion, but a very large excess can dissolve the precipitate through complex formation and increase contamination.

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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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Topic notes: gravimetric analysis, solubility product and organic precipitants, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverscommon ion effectexcess precipitantcomplex formationsolubilitygravimetric analysis

All parts of Question 11