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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

Q4(a). [H₃O⁺] of a phosphoric acid–hydrogen phosphate buffer

Question

Calculate the H₃O⁺ (hydronium ion) concentration for a buffer solution of 2 M phosphoric acid and 1.5 M potassium dihydrogen phosphate [as printed]. [Ka₁ = 7.11 × 10⁻³; Ka₂ = 6.32 × 10⁻⁸]

Model answer

The free solution for 2016 answers questions 1, 2, 3, 5, 6, 7, 9, 10, 11 and 12, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coversbuffer pHHenderson equationphosphoric acidpolyprotic acid

All parts of Question 4