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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(a). Controlling supersaturation in gravimetry

Question

Explain the general methods to avoid the supersaturation during precipitation in gravimetric estimation.

Answer in brief

Minimise local and relative supersaturation by slow precipitation from dilute, well-stirred solutions under conditions favouring crystal growth.

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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 2021 solution2021 question paper

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

Coversrelative supersaturationvon Weimarn rationucleationhomogeneous precipitationdigestiongravimetric analysis

All parts of Question 11