Table 1.

Calculated equilibrium constants for the complexes of hydrogen sulfide (H₂S) with water (H₂O), thiosulfurous acid (H₂S₂O₂), sulfuric acid (H₂SO₄), and carbonic acid (H₂CO₃) at various temperatures

	Equilibrium constant, Keq, cm3•molecule−1
Temperature, K	H2O••H2S (∆E = −1.36)	H2S2O2••H2S(∆E = −5.32)	H2CO3••H2S(∆E = −5.07)	H2SO4••H2S(∆E = −6.69)
200	4.35 × 10−22	1.73 × 10−20	6.21 × 10−20	2.79 × 10−18
210	3.71 × 10−22	8.99 × 10−21	3.42 × 10−20	1.26 × 10−18
220	3.23 × 10−22	4.97 × 10−21	1.99 × 10−20	6.17 × 10−19
230	2.85 × 10−22	2.90 × 10−21	1.23 × 10−20	3.22 × 10−19
240	2.56 × 10−22	1.78 × 10−21	7.87 × 10−21	1.78 × 10−19
250	2.32 × 10−22	1.14 × 10−21	5.25 × 10−21	1.03 × 10−19
260	2.13 × 10−22	7.54 × 10−22	3.63 × 10−21	6.28 × 10−20
270	1.98 × 10−22	5.17 × 10−22	2.58 × 10−21	3.97 × 10−20
280	1.85 × 10−22	3.65 × 10−22	1.89 × 10−21	2.60 × 10−20
290	1.74 × 10−22	2.64 × 10−22	1.42 × 10−21	1.76 × 10−20
298.15	1.67 × 10−22	2.07 × 10−22	1.14 × 10−21	1.31 × 10−20
300	1.65 × 10−22	1.96 × 10−22	1.09 × 10−21	1.23 × 10−20

CCSD(T)/aug-cc-pVTZ//M06-2X/aug-cc-pVTZ calculated binding energies of the H₂S complexes are given in parentheses.