IONIZATION OF HYDROCHLORIC-ACID AT 400-50 0-DEGREES-C AND 500-2500 BAR BY THE SOLUBILITY METHOD

The solubility of metallic silver in aqueous solutions of NaCl (KCl) HCl with controlled hydrogen fugacity is studied in the Cl-2(-) conce ntration range in which the AgCl2- complex is the dominating silver sp ecies. The temperature was varied in the range 400-500 degrees C; and pressure, within 500-2500 bar. The constants of the reaction Ag-(cr) Cl- + HCl0 = AgCl2- + 0.5H(2(g)) are obtained and used to calculate D elta g(Upsilon), (0)(P) and dissociation constants of hydrochloric aci d. At supercritical temperatures and an isothermal compressibility of the solvent beta > 1.42 x 10(-4) bar(-1), O IgK(d)(0) as a function of temperature and logarithm of the solvent density obeys the equation l gK(d)(0)=5.972-0.00936T(K)+8.73 lgd(H2O) (g/cm(3)), lgK(d)(0)=-5.405+3 874.9/T(K)+14.93 lgd(H2O) (g/cm(3)).