Table 2.

Single ion partition coefficients (K_p,i) for hydrocarbon molecular surface^c; Comparison with air-water surface^d.

Ion	toluene	benzene	n-butane	n-propane	average Kp,hc	air-water Kp
Na+	0.00	0.05	-	-	0.03 ± 0.04 (2)e	0.00
K+	0.09	0.14	0.12	0.05	0.10 ± 0.04 (4)	0.12
Li+	0.27	0.29	0.22	0.23	0.25 ± 0.08 (5)	0.08
${\text{NH}}_4^{\text{+}}$	0.56	0.42	-	0.28	0.41 ± 0.12 (4)	0.25
H+	-	0.61	0.59	-	0.60 ± 0.01 (2)	1.50
GuH+	0.99	0.99	0.70	-	-	0.67
${\text{SO}}_4^{2-}$	0.00	0.00	-	-	0.00	0.00
F−	0.88	0.96	-	-	0.92 ± 0.05 (2)	0.53
HO−	-	1.03	-	-	1.00	0.58
Cl−	1.22	1.23	1.24	1.22	1.23 ± 0.08 (6)	0.69
Br−	1.47	1.40	-	-	1.44 ± 0.05 (4)	0.86
${\text{NO}}_3^{-}$	1.48	1.47	-	-	1.47 ± 0.01 (2)	0.98
${\text{ClO}}_4^{-}$	1.56	1.54	-	-	1.55 ± 0.01 (3)	1.77
I−	-	1.62	1.54	-	1.59 ± 0.04 (3)	1.18
SCN−	-	1.80	-	-	1.80	1.64

^cFrom data of Table 1

^d14

^eNumbers in parentheses denote the number of determinations of K_p for a particular ion.