Name
acetic
Ka
1.8 x 10-5
4.5 x 10-7
H3C6H507 3.2 x 10-7
pKa
4.7
Suppose that you were asked to create a buffer solution that buffers around a
pH of 6. As a general rule, if you were asked to select an acid for the
preparation of a buffer solution, you would choose an acid that has a pKa
close to your desired pH (this will give your buffer nearly equivalent amounts
of acid and conjugate base so it will be able to neutralize as much H+ and OH-
as possible). Using the chart below, which acid would you choose to create
your buffer?
Formula
HC2H3O2
carbonic (I) H2CO3
citric (I)
sulfurous
(II)
6.3
6.5
HSO3
6.3 x 10-8
7.2