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Weak Acid and Base Equilibria

AP Chemistry· difficulty 3/5

A 0.10 M weak acid HA has Ka = 1.0e-5.

ICE HA H+ A- I C E 0.10 0 0 -x +x +x ~0.10 x x

Using the small-x approximation, what is [H+]?

  • A

    1.0e-3 M

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  • B

    1.0e-6 M

  • C

    0.10 M

  • D

    1.0e-5 M

Explanation

Ka ~ x^2/0.10 = 1.0e-5, so x^2 = 1.0e-6 and x = 1.0e-3 M = [H+].

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