Abstract
A quasi-adiabatic calorimeter for determining the molar solution enthalpies (Δsol H) of non-volatile solids was constructed. The design of the instrument was adjusted to allow the determination of solution enthalpies of small amounts of solids. For that purpose, the novel apparatus for sample dosage with virtually negligible “blank heat” was built. The rather low heat capacity of the calorimeter was achieved by reducing the volume of the reaction cell (20 mL), the dosing unit, and electric elements (the thermistor and the heater). Good thermal isolation of the reaction cell from the surroundings was accomplished by placing the cell into an evacuated polypropylene vessel. A computer program for processing the calorimetric data according to modified Regnault–Pfaundler method was written. The performance of the calorimeter was tested by determining the heats of the reactions serving as thermochemical standards at 25 °C (the dissolution of KCl and NaCl in water and the dissolution of tris(hydroxymethyl)-aminomethane in 0.1 mol dm−3 HCl(aq)). The obtained data were in very good agreement with the literature values.
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This work was supported by the Ministry of Science, Education and Sports of the Republic of Croatia (Projects 119-1191342-2960 and 119-1191342-2961).
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This paper is dedicated to late Mr. Zvonimir Dojnović.
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Horvat, G., Požar, J., Dojnović, Z. et al. Design and construction of an quasi-adiabatic dissolution calorimeter with a novel dosing apparatus and a low heat capacity. J Therm Anal Calorim 117, 901–907 (2014). https://doi.org/10.1007/s10973-014-3829-9
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DOI: https://doi.org/10.1007/s10973-014-3829-9