. Author manuscript; available in PMC: 2009 Oct 5.

Published in final edited form as: J Phys Chem B. 2008 Jul 16;112(31):9428–9436. doi: 10.1021/jp800816a

Table 1.

Composite b₁(K_p,₃–1) values for selected electrolytes at hydrocarbon and air-water surfaces

	benzene		toluene		propane		butane		air-water
	(ASA=212Å²)		(ASA=249Å²)		(ASA=207Å²)		(ASA=236Å²)

electrolyte	SFEI^a	b₁(K_p-1)	SFEI	b₁(K_p-1)	SFEI	b₁(K_p-1)	SFEI	b₁(K_p-1)	STI^a	b₁(K_p-1)

Na₂S0₄	747	−0.172	909	−0.177^b	-	-	-	-	3.99	−0.194
NaCl	266	−0.064	299	−0.061	273	−0.067	304	−0.065	2.49	−0.126
Nal	130	−0.030	-	-	-	-	-	-	1.64	−0.079
KCl	226	−0.056	275	−0.058	-	-	255	−0.057	2.29	−0.121
KI	-	-	-	-	147	−0.036	138	−0.030	1.66	−0.085
LiCl	192	−0.043	260	−0.050	214	−0.049	241	−0.048	2.37	−0.113
HCl	65.4	−0.014	-	-	-	-	76.3	−0.015	−0.40	0.019
GuHCl	−72.3	0.020	−104	0.024	-	-	20.6	−0.005	1.08	−0.062

The solubility free energy increments are determined from the reported Setschenow coefficients¹–⁶ and are in units of cal mol⁻¹ molar⁻¹, and the surface tension increments¹³,¹⁴ have the same units, normalized by surface area (i.e. cal mol⁻¹ Å⁻² molar⁻¹).

Propagation of the reported 0.5% accuracy of solubility measurements³ results in uncertainties in b₁(K_p-1) of 0.001–0.003. We propose a more conservative estimate of 0.005 for all b₁(K_p-1) values reported here. For a b₁ value of 0.177, this represents an uncertainty in K_p of 0.03.