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Hello, I really need help with the following questions! Could you make sure to explain the...

Hello, I really need help with the following questions! Could you make sure to explain the correct answer?

pKa of ibuprofen is 5.2

1. The pH that is required to convert all of the ibuprofen to ibuprofen anion in a sample is:

a. 3.2

b. anything that is lower than 5.2

c. 7.2

d. anything higher than 5.2

2. The pH that is required to convert all of the ibuprofen anion to ibuprofen in a sample is:

A. 3.2

b. 5.2

c 7.2

d no answer text provided

3. You have 1.98g of isolated pure ibuprofen, what is the maximum amounts in grams of (S,S ) diastereomeric salt that you could have started with?

a. 2.5

b. 2.54

c. 3.14

d. 3.97

Please and thank you!

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