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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 · 2018 · Mains Paper III

Q4(c)(ii). Concentration from transmittance

Question

A 1.0 cm cell transmits 80% of incident light. Absorptivity is 2.0 at the measurement wavelength. Find concentration.

Answer in brief

c=0.04846 in the concentration unit reciprocal to the stated absorptivity.

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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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CoversConcentration from transmittanceAbsorptiometry

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