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A 0 .010 M solution of maleic acid, a monoprotic organic acid, is 14% ionized. What is K a 1 for maleic acid?

Options

  1. A2.3 × 1 0 - 3
  2. B2.3 × 1 0 - 4
  3. C2.0 × 1 0 - 4
  4. D2.0 × 1 0 - 6

Correct answer

B. 2.3 × 1 0 - 4

Step-by-step solution

Degree of dissociation, α = 14 100 = 0.14 Concentration of maleic acid, C = 0.010 M The equilibrium reaction is K a = C 2 α 2 C ( 1 - α ) = C α 2 ( 1 - α ) K a = 0.010 × 0.14 × 0.14 0.86 = 2.3 × 1 0 - 4 .

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