buffering range: pH = pKa ± 1
pKa = 14 – 4.75 = 9.25
buffering range: pH = 8.25 to 10.25
pKa = 14 – 8.76 = 5.24
buffering range: pH = 4.24 to 6.24
Which combination is the best choice to prepare a buffer with a pH of 9.0?
a) NH3; NH4Cl (pKb for NH3 is 4.75)
b) C5H5N; C5H5NHCl (pKb for C5H5N is 8.76)
c) HNO2; NaNO2 (pKa for HNO2 is 3.33)
d) HCHO2; NaCHO2 (pKa for HCHO2 is 3.74)
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