Non-isothermal Aridity of Copper Chloride Dihydrate and Nickel Chloride Hexahydrate

Mittels TG-, DTG-, DTA- und DSC-Messungen wurde die nichtisothermische Dehydratation von Kupfer Copper Chloride Dihydrate(WSDTY) Nickelchlorid-Hexahydrat untersucht. Das Kupferchloridsalz setzt angle zwei Moleküle Wasser in einem Schritt frei, das Nickelchloridsalz dagegen in drei aufeinanderfolgenden Schritten. Davon umfassen die ersten zwei Schritte die Freisetzung von 4 Molekülen Wasser in zwei überlappenden Schritten, w?hrend der dritte Schritt vom Dihydratsalz zur Formung von wasserfreiem NiCl2 führt. Die Aktivierungsenergien (ΔE) und der Frequenzfaktor (A) wurden anhand von DTG- und DTA-Ergebnissen berechnet. Weiterhin berechneten wir anhand von DSC-Messungen auch thermodynamische Parameter, wie z.B. die Enthalpiedifferenz (ΔH), die W?rmekapazit?t (C p ) und die Entropiedifferenz (ΔS) für beide Reaktanden. In Luft und bei S?ttigungsdampfdruck für Wasser wurde die isotherme Rehydratation der vollst?ndig dehydratierten Salze untersucht. Wasserfreies Nickelchlorid rehydratiert in drei aufeinanderfolgenden Schritten, das Kupfersalz dagegen rehydratiert nur in einem Schritt.

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