UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper III
Q5(b). Distribution ratio of an organic acid at three pH values
Question
An organic acid dissolved in 50 mL of water is equilibrated with 50 mL of ether. The distribution coefficient (K_D) is 50 and the dissociation constant (Kₐ) is 5.0×10⁻⁵. Calculate the distribution ratio (D), if the aqueous layer is at pH 3, pH 5 and pH 7.
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 5 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper III.
Coversdistribution ratioDistribution ratio of an organic acid at three pH values
All parts of Question 5
- 5(a) Interference filters10 marks
- 5(b) Distribution ratio of an organic acid at three pH values10 marks
- 5(c) Volumetric Cu in brass without interference from Zn10 marks