ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 7, Number 4
JKCSEZ 7(4)
August 20, 1963 

The distribution ratio of hydrogen cupferrate in H2O-CHCl3 system was considered as a function of pH (HClO4), ionic strength (NaClO4), and cupferron concentration in perchloric acid media, respectively. The values were independent upon pH (1.50∼3.00 range) and ionic strength (0.1∼2.00 range), but they increasing the cupferron concentration in the acidic media. At the infinite dilution, the thermodynamic distribution ratio between chloroform and aqueous phase was 120. 0. The activity coefficients of hydrogen cupferrate in chloroform solution were determined by the distribution ratio. This activity coefficient may be calculated by using the empirical equation, -log fCHCl3 = 0.1285 CCHCl3 + 7.775 C2CHCl3 which represents the experimental data quite well for the solution in 0.1 mole/l order of hydrogen cupferrate concentration.