The Acidic Ingredient in Vinegar Is Acetic Acid $\times$ 10^-5
B)5 $\times$

The acidic ingredient in vinegar is acetic acid. The pH of vinegar is around 2.4, and the molar concentration of acetic acid in vinegar is around 0.85 M. Based on this information, determine the value of the acid ionization constant, K_a, for acetic acid.

A) 2.5 $\times$ 10^-5
B) 5.0 $\times$ 10^-5
C) 4.7 $\times$ 10^-3
D) 1.9 $\times$ 10^-5
E) 7.4 $\times$ 10^-3