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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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budi budi
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11 years ago
Monochloroacetic acid, HC2H2ClO2, is a skin irritant that is used in "chemical peels" intended to remove the top layer of dead skin from the face and ultimately improve the complexion. The value of Ka for monochloroacetic acid is 1.35  10-3. Calculate the pH of a 0.22 M solution of monochloroacetic acid.

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#1
11 years ago
HC2H2ClO2 <=> C2H2ClO2- + H+

1.35 x 10^-3 = x^2/ 0.22-x

0.00297 - 1.35 x 10^-3 x = x^2

x^2 + 1.35 x 10^-3 x - 0.00297=0

x = [H+]= - 1.35 x 10^-3 + sq.rt ( 0.00000182 +0.00119)/2 = 0.0166 M

pH = 1.78
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