Calculate the percent ionization of benzoic acid at the following concentrations. (a) 0.14 M 4.0 2.2 (b) 0.00022 M 4.0 54.35

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Part B, I had tried various times and got the answer of 54 which is incorrect. 

Calculate the percent ionization of benzoic acid at the following concentrations.
(a) 0.14 M
4.0 2.2
(b) 0.00022 M
4.0
54.35
Your response differs from the correct answer by more than 10%. Double check your calculations.
Supporting Materials
Periodic Table
Constants and
E Supplemental Data
Factors
Transcribed Image Text:Calculate the percent ionization of benzoic acid at the following concentrations. (a) 0.14 M 4.0 2.2 (b) 0.00022 M 4.0 54.35 Your response differs from the correct answer by more than 10%. Double check your calculations. Supporting Materials Periodic Table Constants and E Supplemental Data Factors
Expert Solution
Step 1

We need to calculate the percent of ionization for 0.00022 M benzoic acid . 

Ka value of benzoic acid = 6.5*10-5

The ionization of benzoic acid in water is as follows:

     C6H5COOH(aq) ---->C6H5COO-(aq) + H+(aq) 

I       0.00022                          0                      0

C         -x                                  +x                     +x

E     (0.00022-x)                     x                      x

Thus, Ka = [C6H5COO-][H+]/[C6H5COOH]

 

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