# Chemistry

The pH of human blood needs to be between 7.35 and 7.45. You want to prepare a buffer
solution that gives a pH of 7.40. You decide to use a sodium phosphate buffer: the acid is
H2PO−
4 and the conjugate base is HPO2−
4
. You want the concentration of the acid to be
0.0100 M.
1. If the initial H2PO−
4
concentration is 0.0100 M, what is the initial concentration of
HPO2−
4
that will give a pH of 7.40?
2. What is the maximum molarity of acid that this buffer can neutralize without the pH
dropping below 7.35?
3. What is the maximum molarity of base that this buffer can neutralize without the pH
going above 7.45?

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1. Didn't I do parts of this a day or so ago for you. I know i did art 1.
What is the trouble you're having.

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