The heat of dilution of aqueous solution of the chloride(KCl, NaCl, MgCl2,CaCl2) and sulfate (Na2SO4, K2SO4, MgSO4) of Salt Lakes were measured over a concentration range of 0.05-2.1mol. kg-1 at 298.15K. The data were...The heat of dilution of aqueous solution of the chloride(KCl, NaCl, MgCl2,CaCl2) and sulfate (Na2SO4, K2SO4, MgSO4) of Salt Lakes were measured over a concentration range of 0.05-2.1mol. kg-1 at 298.15K. The data were extrapolated to indrite dilution by use of the Debye-Hhckel lindtion law to obtain relative apparent molal enthalpies (Li). The enthalpies of dilution were calculated using the ion interaction model of Pitzer. The experimental enthalpies (△He) were compared with calculated values (△Hc)of dilution.展开更多
The enthalpy changes of Mg0 .2B2O3-27.56% MgCl2-H2O and H3BO3-27.56%MgCls-H2O solution during azeotropic hydrochloric acid titration have been studied withSweden LKB8700-1 precise calorimeter. The results indicated th...The enthalpy changes of Mg0 .2B2O3-27.56% MgCl2-H2O and H3BO3-27.56%MgCls-H2O solution during azeotropic hydrochloric acid titration have been studied withSweden LKB8700-1 precise calorimeter. The results indicated that the reaction enthalpy changes of solutes (expressed as H3BO3 and Mg0.2B203) increase with the increase of their concentrations in the solution. Combined with the pH titration curves ofMg0 .2B2O3-27.56% MgCl2-H2O with that of azeotropic hydrochloric acid, the reactionmechanism of the solutions with hydrochloric acid has been discussed.展开更多
文摘The heat of dilution of aqueous solution of the chloride(KCl, NaCl, MgCl2,CaCl2) and sulfate (Na2SO4, K2SO4, MgSO4) of Salt Lakes were measured over a concentration range of 0.05-2.1mol. kg-1 at 298.15K. The data were extrapolated to indrite dilution by use of the Debye-Hhckel lindtion law to obtain relative apparent molal enthalpies (Li). The enthalpies of dilution were calculated using the ion interaction model of Pitzer. The experimental enthalpies (△He) were compared with calculated values (△Hc)of dilution.
文摘The enthalpy changes of Mg0 .2B2O3-27.56% MgCl2-H2O and H3BO3-27.56%MgCls-H2O solution during azeotropic hydrochloric acid titration have been studied withSweden LKB8700-1 precise calorimeter. The results indicated that the reaction enthalpy changes of solutes (expressed as H3BO3 and Mg0.2B203) increase with the increase of their concentrations in the solution. Combined with the pH titration curves ofMg0 .2B2O3-27.56% MgCl2-H2O with that of azeotropic hydrochloric acid, the reactionmechanism of the solutions with hydrochloric acid has been discussed.
