Problem: What is the pH of a 0.40 M solution of benzoic acid, C6H5COOH? (The Ka value for benzoic acid is 6.3 x 10-5.)

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FREE Expert Solution

Step 1. Calculate [H+]:

C6H5COOH   ⇌   C6H5COO-   +  H+

Ka=productsreactantsKa=[H+][C6H5COO-][C6H5COOH]=6.3×10-5[x][x][0.40]=6.3×10-5x2=(6.3×10-5)(0.40)

x = 5.020x10-3 M = [H+]


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Problem Details

What is the pH of a 0.40 M solution of benzoic acid, C6H5COOH? (The Ka value for benzoic acid is 6.3 x 10-5.)

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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.

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