Acetic acid is known to be a weak acid. What will happen to the acidity of the solution when sodium acetate is added to acetic acid?

Question

A. The solution will become more acidic.
B. The pH will remain the same.
C. The solution will become less acidic.
D. The solution will become less basic.

Answer 1

Write the ionization expression for HAc.
HAc ==> H^+ + AC^-

now K = (H^+)(Ac^-)/(HAc)
Now if NaAc is added, that increases the Ac^- (the common ion effect), that shifts the equilibrium to the left. What happens to the H^+ and how does that affect the pH. By the way, this is how you make a buffer solution.

Answer 2

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Answer 3

The correct answer is C. The solution will become less acidic. :)