Which of the following solutions would have the highest pH value? Assume that they are all initially 0.10 M concentrations of weak acid at 25 degree C.
a) HF Ka = 3.5 x 10^-4
b) HCN Ka = 4.9 x 10^-10
c) HNO2 Ka = 4.6 x 10^-4
d) HCHO2 Ka = 1.8 x 10^-4
e) HClO2 Ka = 1.1 x 10^-2