Determinación experimental del calor de formación del 2,3-dimercaptopropanol a partir de su calor de combustión y comparación con valores computacionales

Abstract

This monograph contains the results obtained from the experimental calculation of the Heat of combustion and the Heat of formation of Dimercaprol. For this, it was initially verified that the LABSYS PRO IKA C 2000 calorimeter was in optimal conditions using solid benzoic acid to observe the difference between the experimental and theoretical values. Subsequently, the amount of Dimercaprol to be combusted was weighed and proceeded to introduce it into the equipment to measure the heat of combustion. Then, a titration of the washing solution of the calorimetric vessel was carried out, using 0.78 M NaOH as primary standard and Phenolphthalein as indicator. Finally, the results of the readings were compared with the computational values ​​to validate them. The results obtained show a net heat of combustion of Dimercaprol of 25476 J/g for one sample, a heat of formation of H2SO4 of -507.6 cal and a total heat of formation of -39594.9 cal/mol. The contrast with the computational values ​​reflects a difference of -5.99 kcal/mol for the heat of formation of Dimercaprol, becoming a matter of investigation and validity for subsequent results. This study seeks to promote research into the thermochemical properties of Dimercaprol, in order to expand the databases and references that currently exist.