The nitrous acid/sodium nitrite conjugate pair has been chosen to prepare a buffer solution. What should...
The nitrous acid/sodium nitrite conjugate pair has been chosen to prepare a buffer solution. What should the concentration ratio of NO2-/HNO2 be if the desired pH of this buffer is 4.00? (Ka of HNO2 = 4.27 x 10-4)
Homework Answers
use:
pKa = -log Ka
= -log (4.27*10^-4)
= 3.37
use:
pH = pKa + log {[conjugate base]/[acid]}
4 = 3.37+log {[NO2-]/[HNO2]}
log {[NO2-]/[HNO2]} = 0.6304
[NO2-]/[HNO2] = 4.27
Answer: 4.27
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