The dissociation constants of AgCl and Ag₂SO₄ were determined in the mixtures of ethanol - water, N,N-dimethylformamide - water, 1,4-dioxane- water, tetrahydrofuran - water and acetonitrile - water of concentrations 10, 30, 50, 70, 90 % (w/w). DEnsities, viscocities, conductivities and dielectric constants of these mixtures and saturated solutions of AgCl and Ag₂SO₄ in these mixtures were measured. The pK values of AgCl and Ag₂SO₄ were obtained from conductivity measurements using by conductivity, Kirkwood - Westheimer and dielectric constant methods. The calculated pK values of AgCl and Ag₂SO₄ for these systems, plotted against 1/D. Keywords :