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Proton affinities of sulfate and bisulfate ions

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Abstract

The decomposition of (NH4)2SO4(s) has been studied by DSC. The decomposition takes place in two steps to produce NH3(g) and NH4HSO4(s) in the first and NH3(g) and H2SO4(g) in the second. Enthalpies for these reactions are 195 and 169 kJ/mole, respectively. These values permit calculation of the proton affinities of SO 2−4 and HSO −4 , and the values found are 1847 and 1338 kJ/mole, respectively.

Zusammenfassung

Die Zersetzung von (NH3)2SO4(s) wurde mittels DSC untersucht. Sie läuft in zwei Stufen ab, wobei während der ersten NH3(g) und NH4HSO4(s) und während der zweiten NH3(g) und H2SO4(g) gebildet werden. Die Enthalpien für diese Reaktionen belaufen sich auf 195 bzw. 169 kJ/mol. Diese Angaben ermöglichen die Errechnung der Protonenaffinität von SO 2−4 und HSO −4 , deren Werten 1847 bzw. 1338 kJ/mol betragen.

Резюме

Методом ДСК изучено р азложение твердого сульфата аммония. Раз ложение протекает в две стади и с образованием на пе рвой стадии газообразного аммиа ка и твердого кислого сернокислог о аммония, а на второй с тадии —газообразных аммиака и серной кисл оты. Энтальпии этих реакц ий равны, соответстве нно, 195 и 169 кдж/моль, что позволил о вычислить сродство к протону су льфати гидросульфат-ионов и которое, соответстве нно, равнялось 1847 и 1338 кдж/моль.

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References

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Authors and Affiliations

  1. Department of Chemistry, Illinois State University, 61761, Normal, Illinois, USA

    J. E. House Jr. & K. A. Kemper

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  1. J. E. House Jr.
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  2. K. A. Kemper
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House, J.E., Kemper, K.A. Proton affinities of sulfate and bisulfate ions. Journal of Thermal Analysis 32, 1855–1858 (1987). https://doi.org/10.1007/BF01913977

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  • DOI: https://doi.org/10.1007/BF01913977

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