Instrumentation and calibration of the Calvet calorimeter: Enthalpy of solution of PrBr _3 at standard conditions (Conference Paper)

摘要

The original Calvet calorimeter, made from aluminum block, were instrumented. The cells for the solution calorimetry measurement have been projected and constructed. The calibration of calorimeter was performed by measurement of the dependence of reference material on temperature and the influence of mechanical events on thermograms. The enthalpies of solution in water and 0.01 M HCl were investigated for chlorides and bromides of alkali metals (Na?Cs), PrBr _3 and Rb _3PrBr6. The enthalpies of solution of alkali halides have been compared to the reference data obtained for infinite solution. The decomposition of Rb _3PrBr6 at temperatures lower than 399 K has been stated. The enthalpy of solution PrBr _3 at 298.15 K has been determined.