Acetic acid is the active ingredient in vinegar. In a solution of acetic acid the following equilibrium?

established: HC2H3O2(aq) H+(aq) + C2H3O2- (aq). The equilibrium constant for this reaction is 1.8 ´ 10-5. What is the equilibrium constant for the reaction H+(aq) + C2H3O2-(aq) HC2H3O2(aq)?

1.8 ´ 10- 5
4.2 ´ 10- 3
5.6 ´ 104
3.1 ´ 109

Answer:
The Ionization of acetic acid is a reversible reaction and the equilibrium constant for the forward reaction or the reverse reaction is the same.

So the answer is 1.8 x 10^-5
5.6 x 10^4 (1/keq forward)

Bf
4th yr Chem Major
U of O (Canada)

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