In this research, the thermodynamics of H-2 Solution and hydride formation in a series of disordered Pd-Ag alloys has been determined using both reaction calorimetry and equilibrium P-H2-composition-T data. Trends of Delta H-H and Delta S-H with both H and Ag concentration have been determined. For the Pd0.76Ag0.24 alloy, which does not form a hydride phase, Delta H-H and ASH both exhibit minima with H/(Pd0.76Ag0.24) followed by a linear increase of the former. A linear increase of Delta H-H is found for all of the alloys in the high H content region beyond the two-phase region or, if, there is no two-phase region, in the high H content region. Delta H-H(degrees) at infinite dilution of H decreases with atom fraction Ag, X-Ag, up to about 0.40 and then increases. Enthalpies for hydride formation/decomposition, 1/2H(2)(g) + dilute <-> hydride, have been determined calorimetrically for alloys which form two phases (303 K). The enthalpies for hydride formation become more exothermic with X-Ag while the corresponding entropy magnitudes are nearly constant, 46 +/-2 J/K mol H.