(mol-g/dm3)

Kex


(kJ/mol)

3.12

9.24810+23

-136.838

3.11

1.55410+22

-126.707

3.09

1.56010+21

-121.006

3.01

1.11210+20

-114.457

2.95

1.20810+19

-108.952

2.91

1.56810+18

-103.890
Table 7: The extraction constant and free energy of equilibrium data for extraction of Cu (II) with using lauric acid diluted in benzene at 298.2 K.