# Problem: 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 X 10 -3. Calculate the pH of a 0.10-M solution of monochloroacetic acid.

###### FREE Expert Solution

We are being asked to calculate the pH of a 0.10-M solution of monochloroacetic acid (HC2H2ClO2).

Since we’re dealing with a weak acid, we will have to create an ICE chart to determine the equilibrium concentration of each species:

HC2H2ClO2 weak acid proton donor
H2O → will act as the weak base proton acceptor

Equilibrium reaction:        HC2H2ClO2(aq) + H2O(l)  C2H2ClO2(aq) + H3O+(aq)

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###### Problem Details

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 X 10 -3. Calculate the pH of a 0.10-M solution of monochloroacetic acid.