Problem: What is the [H3O+] and pH of 0.200 M solution of benzoic acid, C7H6O2? The Ka value for benzoic acid is 6.3 x 10–5.

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We are being asked to determine the [H3O+] and pH of a 0.200 M solution of benzoic acid.

The equilibrium reaction is (the Ka of benzoic acid can be found in books or online):

C6H5COOH(aq) + H2O(l) ⇌ C6H5COO(aq) + H3O+(aq)       Ka = 6.3 × 10–5


Since C6H5COOH has a small Ka value, it is a weak acid. We need to construct an ICE chart.


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What is the [H3O+] and pH of 0.200 M solution of benzoic acid, C7H6O2? The Ka value for benzoic acid is 6.3 x 10–5.

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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.