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Title: pH from Pka? Monochloroacetic acid, HC2H2ClO2, is a skin irritant that is used in "chemical peels"...? Post by: budi on Sep 4, 2012 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.
Please help! Title: pH from Pka? Monochloroacetic acid, HC2H2ClO2, is a skin irritant that is used in "chemical peels"...? Post by: Rkumar2577 on Sep 4, 2012 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 |