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Unformatted text preview: 4 b (8pts). Below are given a row of pka values. Indicate the best buffering range for each and
decide (yes or no) whether the particular buffer could be used in biological systems/under
physiological conditions.
~ 6-7 (87 )
pKa
Best Buffering Range
Useful with Biological Systems
(Yes or No)
4.2
3.2- 5.2
No
6.37
5.37- 7.37
yes
9.8
8.8 - 10.8
No
7.2
6.2 - 8.2
yes
8..3
7.3 - 9.3
No
6.8
5.8 - 7.8
yes
change ?
5. (6 pts). A laboratory worker mixes ] liter of 1 M Acetic acid with 1/2 liter of IM Sodium
hydroxide. What is the pH of this solution? (Use attached pKa table for various acids).
[A]
PH = pKa + 109 THAT
= 4.76 + log + [ -3 - 1
= 4.76 + 0
PH = 4.76...
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