Arrange the following 0.10 M
solutions from lowest to highest pH:
NaF, NaC2H3O2, C5H5NHCl, KOH, HCN.
(Ka for HCN is 6.2 × 10–10; Ka for HF is 7.2 × 10–4; Ka for HC2H3O2
is 1.8 × 10–5; and Kb for C5H5N is 1.7 × 10–9)
A) C5H5NHCl, HCN, NaF, NaC2H3O2,KOH
B) NaF, NaC2H3O2, HCN, C5H5NHCl, KOH
C) KOH, NaC2H3O2, NaF, HCN, C5H5NHCl
D) HCN, C5H5NHCl, NaF, NaC2H3O2, KOH
E) none of these