Table 2. Thermochemical parameters in MeCN, for (H-1)^–, HCOO^–, and H₂.

Compound	pKa	(kcal mol–1)
(H-1)–	23.7 ± 1	45.5 ± 0.5
H2	55.5 (ref. 20)	76 (ref. 20)
HCOO–	—	44 (ref. 21)