TABLE 5.

Parameters for determining the equivalent hydrated radius, r_H, and equivalent hydrated diameter, d_H, for the three alkali cations, nitrate, and chloride

Ion	ri (Å)	di (Å)	λ0	rs (Å)	CF	rH (Å)	dH (Å)
Li+	0.60	1.2	38.6	2.39	1.57	3.74	7.5
Na+	0.95	1.9	50.10	1.84	1.77	3.26	6.5
Cs+	1.69	3.4	77.2	1.19	2.08	2.48	5.0
	1.76	3.5	71.46	1.29	2.03	2.62	5.2
Cl−	1.81	3.6	76.35	1.21	2.07	2.50	5.0

Ionic radius, r_i, and ionic diameter, d_i, data for the alkali cations and Cl⁻ were from Pauling (43) (see also Table 3.1 in Robinson and Stokes (22)) and the value was from Grunwald and Effio (44). λ⁰ values were from Appendix 6.2 of Robinson and Stokes (22). The Stokes' law radius, r_s, calculated from limited equivalent conductivity using Eq. A7 in which r_s = 92.1/λ^o assuming the viscosity of water, η^o = 0.008903 poise. The CF, determined from the fit of the tetra-alkyl ammonium ion data in Fig. 8, was calculated from r_s using the fitted equation (A8) and the equivalent hydrated radius r_H was determined by multiplying r_s by CF (see text for details).