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AIIMS2004ChemistryIonic Equilibrium

What is the pH of 0.01 M glycine solution? For glycine, K_ a₁ =4.5 10⁻³ and K_ a₂ =1.7 10⁻¹⁰ at 298 ~K ?

Options

  1. A3.0
  2. B10.0
  3. C6.1
  4. D7.2

Correct answer

C. 6.1

Step-by-step solution

aligned & K=K a₁ K a₂=4.5 10⁻³ 1.7 10⁻¹⁰ & =7.65 10⁻¹³ & [ H ⁺ ]= K C = 7.65 10⁻¹³ 0.01 & = 7.65 10⁻¹⁵ =0.87 10⁻⁷ & pH =- 0.87 10⁻⁷=7-0.93=6.07 & aligned

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