. 2021 Apr 20;6(17):11355–11366. doi: 10.1021/acsomega.1c00340

Table 2. Optimized Standard-State Thermodynamic Properties and the UNIQUAC Surface and Size Parameters of All Species Necessary for the Co(II) Chloride Solvent Extraction Model with TOMAC in Toluene.

species	ΔG_f⁰ (kJ mol^–1)	υ⁰^a(L mol^–1)	q^b	r^c
Co²⁺	–54.39
CoCl⁺	–176.89
CoCl₄²⁺	–538.65
TOMAC	218.15	0.444	12.27	16.50
Q₂CoCl₄	139.65	1.031	27.34	34.84

Molar volume of the pure liquid.

UNIQUAC surface parameter.

UNIQUAC size parameter.