Question

The ionization constant of acetic acid is 1.74 × 10. Calculate the degree of

dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

Answer 1

Method 1

Since Ka >> K_w, :

Method 2

Degree of dissociation,

c = 0.05 M

K_a = 1.74 × 10^–5

Thus, concentration of

Hence, the concentration of acetate ion in the solution is and its Ph is.