Question
Calculate the pH of a potassium phosphate buffer if the pKa of KH2PO4 is 7.2 and the acid-base ratio is 2:1
I took Chemistry 7 years ago and am in a review for a Biochem course I am takin. I do not remember the basics so any help with how to get started or what equations to use would be appreciated!
I took Chemistry 7 years ago and am in a review for a Biochem course I am takin. I do not remember the basics so any help with how to get started or what equations to use would be appreciated!
Answers
DrBob222
The Henderson-Hasselbalch equation is the one to use.
pH = pKa + log (base)/(acid)
If the aicd/base ratio is 2:1, then the base/acid ratio is 1/2; therefore,
pH = 7.2 + log (1/2)
pH = pKa + log (base)/(acid)
If the aicd/base ratio is 2:1, then the base/acid ratio is 1/2; therefore,
pH = 7.2 + log (1/2)