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)

79% (207 ratings)
View Complete Written Solution
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.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Rios' class at VALENCIA.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.