Calculate the percent dissociation of the acid in each of the following solutions?

Question

A. 0.50M acetic acid 

B. 0.050M acetic acid 

C. 0.050M acetic acid 

 

D. Use Le Chatlier's principle to explain why percent dissociation increases as the concentration of a weak acid decreases.

 

E. Even though the percent dissociation increases from a to c, the [H+] decreases. Expain.

Answer 1

You need to know the Ka for the acid.

Ka = [H+][Ac-]/[HAc]

plug in x for H+ and Ac- and the given concentration of HAc in the denominator and solve for x 

Finally divide that value by the [HAc] and x 100 to get % dissociation.