Calorimetric studies of NaI solutions in binary organic isodielectric mixtures

Abstract

Enthalpies of NaI solution in methanol mixtures with nitromethane (NM), N,N-dimethylformamide (DMF) and acetonitrile (ACN) were measured at 298.15 K in the entire range of mixture compositions. The standard solution enthalpy in methanol–DMF has a monotonic character, while in the case of the MeOH–NM system it exhibits a maximum in the region of high methanol content. The most complex character of the solution enthalpy plot with a large minimum in the high acetonitrile content region is observed in the case of the MeOH–ACN mixture. A possible explanation of this behaviour is discussed. Enthalpic pair interaction coefficients for the systems under study have been calculated and analysed.