Abstract
The semi-quantitative determination of the heat of dehydration reactions has been realised by using a differential thermal analysis apparatus and differences in the heat of dehydration between water of crystallization (Δ H < 13 kcal/mole) and water of constitution (Δ H > 13 kcal/mole) have been established for some alums MI MIII (SO4)2 12 H2O (MIII=Cr, Al; MI=K, NH4).
Résumé
L'emploi d'un analyseur thermique différentiel semi-micro a permis de déterminer semi-quantitativement les variations d'enthalpie accompagnant la déshydratation des aluns MI MIII (SO4)2 12 H2O (MIII=Cr, Al; MI=K, NH4) et d'établir ainsi une distinction entre l'eau de cristallisation (Δ H < 13 kcal/mole) et l'eau de constitution (Δ H > 13 kcal/mole).
Zusammenfassung
Durch Anwendung eines differentialthermoanalytischen Halbmikrogeräts gelang es, die Enthalpieänderung der Dehydratation von Alaunen der Zusammensetzung MIMIII(SO4)2 12 H2O (MIII=Cr, Al; MI=K, NH4) zu bestimmen und Kristallwasser (Δ H < 13 kcal/Mol) und Strukturwasser (Δ H > 13 kcal/Mol) zu unterscheiden.
Резюме
Реализировано полук оличественное определение теплово го эффекта реакций дегидратации по мето ду дифференциальног о термического анализ а (ДТА) и установлена разница между криста ллизационной водой (Δ Н < 13 ккал/мол) и конституци онной водой (ΔН > 13 ккал/мол) в случае некоторых квасцов MI MIII (SO4)2 · 12 Н2О · (МIII=Cr, Аl; МI= K, NH4).
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Bibliographie
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Harmelin, M. Evaluation par analyse thermique differentielle des chaleurs de deshydratation de plusieurs aluns de chrome, aluminium et fer. Journal of Thermal Analysis 1, 137–150 (1969). https://doi.org/10.1007/BF01909664
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DOI: https://doi.org/10.1007/BF01909664