Construcción de un calorímetro para la determinación de entalpías de inmersión

Abstract

The construction and use of a heat conduction calorimeter is presented, given specific details about every component, focusing in the system used to sensor the heat flow. The calorimeter was electrically and chemically calibrated and was used for determining of the immersion enthalpy of activated carbons in aqueous solutions of compounds with capacity of ionization, such as phenol and lead nitrate. In the first case, the immersion enthalpy of an activated carbon with superficial area of 950 m2g-1 gave an average value of 48.9 ±1.4 Jg-1. In the second case, Pb2+ aqueous solutions and an activated carbon with superficial area of 585 m 2g-1, the immersion enthalpies ranged between 5 and 65 Jg-1. It is concluded that the constructed calorimeter has characteristic of base line stability, calibration constant and sensibility, appropriate to determine immersion enthalpies of porous solids in liquids.