Table 3. Comparison of pK_as of 1-Methylimidazole and Salicylic Acid Determined Using the Various Literature Values for pK_a^imid.

1-methylimidazolea		salicylic acidb		imidazole
determined pKadetc	ΔpKad	determined pKadetc	ΔpKad	reported pKaimid
4.83	1.32	5.14	1.66	5.1 ± 0.232
6.00	0.15	6.60	0.2	6.26 ± 0.0626
6.10	0.05	6.64	0.16	6.37 ± 0.0433
6.16	–0.01	6.78	0.02	6.46e
6.63	–0.48	7.05	–0.25	6.94 ± 0.0634

^apK_a = 6.15.²⁶

^bpK_a = 6.8.³¹

^cpK_a^det calculated using pK_a.

^dpK_a^det, literature value.

^eThis work.