Instrumentation and calibration of the Calvet calorimeter

Abstract

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 (NaÁÁÁCs), PrBr 3 and Rb 3 PrBr 6. The enthalpies of solution of alkali halides have been compared to the reference data obtained for infinite solution. The decomposition of Rb 3 PrBr 6 at temperatures lower than 399 K has been stated. The enthalpy of solution PrBr 3 at 298.15 K has been determined.