Which of the following buffer systems would you use to create a buffer with a pH of 4.0? The Ka of nitrous acid, HNO2 is 4.5 x 10-4.
a) 0.30 M HNO2 / 0.22 M NaNO2
b) 0.22 M HNO2 / 0.30 M NaNO2
c) 0.11 M HNO2 / 0.50 M NaNO2
d) 0.50 M HNO2 / 0.11 M NaNO2
e) 0.30 M HNO2 / 0.30 M NaNO2
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