Monochloroacetic acid (HC2H2ClO2) is a skin irritant that is used in \"chemical

Question

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 0.10 M solution of monochloroacetic acid.

Explanation / Answer

HCH2ClO2 --> CH2ClO2- + H+ initial concentration 0.1M at equilibrium 0.1-x. . . . . . . . . .. . . x. . . . . . .. .x Ka = 1.35 x 10^-3 = x^2/ 0.1-x 0.000135 - 1.35 x 10^-3 x = x^2 x^2 + 1.35 x 10^-3 - 0.000135x =0 sloving we get x=0.011M pH = -log(0.011)=1.96

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