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

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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)?

Answer 1

Answer #1

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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Answer 2

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