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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

Q6(a). Acid required by an equimolar carbonate mixture

Question

Find out the volume in mL of 0.1 N HCl solution required to react completely with 1.0 g of a mixture of Na₂CO₃ and NaHCO₃ containing equimolar amounts of two components.

Answer in brief

The required volume is 157.9 mL, or approximately 158 mL of 0.1 N HCl.

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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: acid–base titrations, indicators and buffers, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversNa2CO3 NaHCO3 mixtureacid-base titrationnormalityequivalentssodium carbonate titration

All parts of Question 6