UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper III
Q2(a). Degree of hydrolysis and pH of 0.01 M Na₂CO₃
Question
Calculate the degree of hydrolysis and pH of 0.01 M Na₂CO₃ solution. Given Ka₁ = 4.31 × 10⁻⁷ and Ka₂ = 5.61 × 10⁻¹¹.
Model answer
The free solution for 2019 answers questions 1, 3, 4, 6, 7 and 10, 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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Coverssalt hydrolysissodium carbonate pHdegree of hydrolysisKh = Kw/Ka2
All parts of Question 2
- 2(a) Degree of hydrolysis and pH of 0.01 M Na₂CO₃10 marks
- 2(b) Bringing a sparingly soluble salt into solution10 marks
- 2(c) Why Eriochrome Black T fails for Cu²⁺, Ni²⁺, Co²⁺, Cr³⁺, Fe³⁺, Al³⁺5 marks
- 2(d) Errors in iodine titrations with starch5 marks