Acrylic acid ( H C 3 H 3 O 2 ) is used in the manufacture of paints and plastics

Question

Acrylic acid (HC3H3O2) is used in the manufacture of paints and plastics. The pKa of acrylic acid is 4.25. Calculate the pH in 0.180M  acrylic acid. Acrylic acid (HC3H3O2) is used in the manufacture of paints and plastics. The pKa of acrylic acid is 4.25. Acrylic acid (HC3H3O2) is used in the manufacture of paints and plastics. The pKa of acrylic acid is 4.25. Acrylic acid (HC3H3O2) is used in the manufacture of paints and plastics. The pKa of acrylic acid is 4.25. Calculate the pH in 0.180M  acrylic acid.

Explanation / Answer

Ka = ([H+][A-])/[HA])

Let concentration of dissociated acrylic acid be x.

-10^-pKa =Ka=5.623*10^-5 = (x^2)/(0.180 - x)

Rearrange:

0.000008997 - 0.000056x - x^2 = 0

x = 0.00297

Therefore:

[H+] = 0.002971 M

pH = -log[H+] = 2.52

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