If an acid, HA, is 10.0% dissociated in a 1.0 M solution, what is K_a for this acid? A) 6.3 * 10^-² B) 9.1 * 10^-² C) 8.1 * 10^-¹ D) 1.1 * 10^-² E) none of these

Name: If an acid, HA, is 10.0% dissociated in a 1.0 M solution, what is K a for this acid? A) 6.3 * 10 - 2 B) 9.1 * 10 - 2 C) 8.1 * 10 - 1 D) 1.1 * 10 - 2 E) none of these
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Quizplus · Accepted Answer

The degree of dissociation is 0.10, so [A-] = [H+] = 0.10 M and [HA] = 0.90 M. Ka = ([H+][A-])/[HA] = (0.10 * 0.10) / 0.90 = 0.0111 or 1.1 x 10^-2.

If an Acid, HA, Is 10