THERMODYNAMIC ANALYSIS OF THE CHEMICAL-REACTIONS OF CHROMIUM WITH AQUEOUS-SOLUTIONS

The available data on the thermodynamic characteristics (DELTAH(f)0, 2 98, DELTAG(f)0, 298, S0 298) of chromium and its oxides, hydroxides, a qua ions, mono- and polynuclear hydroxo complexes were examined. Empir ical methods of estimation were used for a number of forms on which th ere is no information. As a result, a complete, thermodynamically cons istent system of thermal constants was obtained. Some results of model ing and computer calculation of homogeneous and heterogeneous equilibr ia in the ranges T = 298-623 K; pH298(0) = -1-14; [O2], [H-2] = 0-10(- 3) mole/kg; and [Cr] = 10(-9)-10(-1) mole/kg (for homogeneous systems) are presented.