buffer → pKa of acid must be near on the desired pH
pKa = -log(Ka)
a. 7.9x10-12 = 11.10
b. 2.0x10-5 = 4.70
Which weak acid would be best to use when preparing a buffer solution with a pH of 9.90?
a) An acid with Ka = 7.9 times 10-12
b) An acid with Ka = 2.0 times 10-5
c) An acid with Ka = 2.5 times 10-7
d) An acid with Ka = 1.6 times 10-6
e) An acid with Ka = 2.0 times10-8
f) An acid with Ka = 1.3 times 10-10
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