The enthalpy of precipitation of univalent cations with tetraphenylborate by titration calorimetry

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Abstract

The enthalpy of precipitation of six common univalent cations with the tetraphenylborate anion has been measured at 25.0°C. Reaction entropies range from -8.24kcal/mole for ammonium to -19.7 kcal/mole for silver(I). The entropy of reaction was computed from the above measurements and the corresponding Gibbs free energy changes. A linear relationship exists between ΔF°′ and ΔH°′. The entropy of precipitation of ammonium ions was +5.0 e.u., an unusually large positive value.

Original languageEnglish (US)
Pages (from-to)505-511
Number of pages7
JournalThermochimica Acta
Volume2
Issue number6
DOIs
StatePublished - Sep 1971

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