DISSOCIATION-CONSTANTS AND THERMODYNAMIC PARAMETERS OF THE FIRST AND THE 2ND DISSOCIATION REACTIONS OF SUCCINIC ACID IN 20-PERCENT (V V) DIOXAN/

pK1 and pK2 values of succinic acid at zero ionic strength have been d etermined in 20% (v/v) dioxan at different temperatures (30-60 degrees C) from e.m.f. measurements of, glass electrode, HCl, buffer, AgCl, A g cell. The thermodynamic properties (Delta G degrees, Delta H degrees , and Delta S degrees) for the first and the second dissociation react ions have been computed, discussed and analyzed in terms of solute-sol vent interactions. Delta H degrees-Delta S degrees correlation indicat es that the first dissociation reaction is entropy controlled and reve als the existence of compensation effect in the second dissociation re action.