1. The degree of ionization is defined as the fraction of molecules of a weak el

Question

1. The degree of ionization is defined as the fraction of molecules of a weak electrolyte that reacts with water to give ions. Calculate the degree of ionization (amount of [H+] generated from the dissociation of acetic acid in water) of acetic acid in an initial 30mL sample of 0.100 M C2H4O2 solution, where:

degree of ionization of acetic acid = [H+ due to dissociation of acetic acid in water] / [initial concentration acetic acid] [H+ due to dissociation of acetic acid in water] = antilog[-pH] so, degree of ionization of acetic acid = antilog[-pH] / [0.100 M] C2H4O2

Explanation / Answer

pKa of acetic acid is 4.76 taking antilog and using Ka to find [H+] C*x^2/(1-x) = 10^(-4.76) where C = 0.1 x = 0.013 Cx = [H+] = 1.3*10^(-3) pH = 2.8860 degree of ionization of acetic acid = 0.013

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