Enter your answer in the provided box. in a 0.740 m solution, a weak acid is 12.5% dissociated. calculate ka of the acid.

Question

Chemistry

Alexandria Stuart

13 June, 04:16

Enter your answer in the provided box. in a 0.740 m solution, a weak acid is 12.5% dissociated. calculate ka of the acid.

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Nelson Guerra · Answer 1

Answer is: the acid dissociation constant for weak acid is 0.0132.

Chemical reaction: HA (aq) ⇄ A⁻ (aq) + H⁺ (aq).

c (weak acid) = 0,740 M.

α (weak acid) = 12,5% : 100% = 0,125.

Ka = α² · c / 1 - α.

Ka = 0,125² · 0,740 M / 1 - 0,125.

Ka = 0,0132 M = 1,32 ·10⁻² M.

Ka is the acid dissociation constant, which quantifies the extent of acid dissociation (in this example HA) in water.