Problem: Phenylacetic acid (C6H5CH2COOH + H2O ⇌ C6H5CH2COO- + H3O+) is one of the substances that accumulates in the blood of people with phenylketonuria, an inherited disorder that can cause mental retardation or even death. A 0.085 M solution of C6H5CH2COOH has a pH of 2.68.Calculate the Ka value for this acid.

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FREE Expert Solution

C6H5CH2COOH + H2⇌ C6H5CH2COO- + H3O+


Step 1

[H+] = 10-pH[H+] =10-2.68

[H+] = 2.0893x10-3 M


Step 2

[C6H5CH2COO-] = [H+] = 2.0893x10-3 M

[C6H5CH2COOH] = 0.085 M - 2.0893x10-3 M = 0.08291 M


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Problem Details

Phenylacetic acid (

C6H5CH2COOH + H2⇌ C6H5CH2COO- + H3O+

) is one of the substances that accumulates in the blood of people with phenylketonuria, an inherited disorder that can cause mental retardation or even death. A 0.085 M solution of C6H5CH2COOH has a pH of 2.68.

Calculate the Ka value for this acid.

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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 Selampinar's class at UCONN.