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Most Important Selected Qs for JEE AdvancedChemistryIonic Equilibrium

Paragraph: Buffer is a solution whose pH does not change significantly on addition of a small amount of acid or alkali or on dilution. Answer the following questions: Question: The ratio of pH (approximately) of solution (I) containing 1 mole of CH ₃ COONa and 1 mole of HCl and solution (II) containing 1 mole of CH ₃ COONa and 1 mole of acetic acid in one litre is :

Options

  1. A1: 2
  2. B2: 1
  3. C1: 3
  4. D3: 1

Correct answer

A. 1: 2

Step-by-step solution

[ CH ₃ COOH ]= No. of moles Volume of solution = 1 1 =1 [ H ⁺ ]= C = C K _ a C = K _ a C = K _ a i.e. pH ₁=- 1 2 K _ a = 1 2 pK _ a Solution (II) 1 CH ₃ COONa + 1 CH ₃ COOH It is buffer. pH ₂= pK _ a + [ CH ₃ COONa CH ₃ COOH ] aligned & pH ₂= pK _ a + 1 1 & pH ₂= pK _ a & pH ₁ pH ₂ = 1 2 aligned

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