Effect of isotopic hydrogen exchange on thermochemistry of solution of ammonium halides and deuteroammonium in water, heavy water and their mixtures with dimethylsulfoxide

Standard dissolution enthalpies of ammonium and deuteroammonium bromides and iodides in water, heavy water and their mixtures with dimethylsulfoxide (DMSO) at 298.15 K and compositions up to X=0.4 (X-mole part of DMSO) are presented. The influence of isotopic hydrogen exchange on the values of the standard dissolution enthalpies of NH4Cl, ND4Cl, NH4Br, ND4BR and NH4I in H2O, D2O and H2O (D2O)-DMSO mixture at 298.15 K, as well as of NH4Cl and ND4Cl in the same solvents at 323.15 K has been discussed. The values of NH4Cl and ND4Cl crystal lattice enthalpies have been compared. 15 refs., 3 tabs