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An acid, HA, has an acid dissociation constant of 7*10-3. Which of the following is the...

Question

An acid, HA, has an acid dissociation constant of 7*10-3. Which of the following is the...
  1. An acid, HA, has an acid dissociation constant of 7*10-3. Which of the following is the expected pH of a solution that contains equal concentrations of HA and A-(the conjugate base of HA)?
  1. 1.8
  2. 2.2
  3. 3.7
  4. 4.9

Answers

HA <------> H+ + A-

Ka = [H+][A-]/[HA]

If concentrations of HA and A- are same then the equation of Ka becomes as written below.

Ka = [H+]

pH = -log(Ka)

     = -log(7*10^-3)

     = 2.15

     = 2.2


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