Heat Capacities of Aqueous Solutions of K4Fe(CN)6, K3Fe(CN)6, K3Co(CN)6, K2Ni(CN)4, and KAg(CN)2 at 298.15 K

Y. Kianinia; L. Hnědkovský; G. Senanayake; C. Akilan; M.R. Khalesi; M. Abdollahy; A.K. Darban; G. Hefter

doi:10.1021/acs.jced.8b00078

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Heat Capacities of Aqueous Solutions of K4Fe(CN)6, K3Fe(CN)6, K3Co(CN)6, K2Ni(CN)4, and KAg(CN)2 at 298.15 K

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Heat Capacities of Aqueous Solutions of K4Fe(CN)6, K3Fe(CN)6, K3Co(CN)6, K2Ni(CN)4, and KAg(CN)2 at 298.15 K

Y. Kianinia, L. Hnědkovský, G. Senanayake, C. Akilan, M.R. Khalesi, M. Abdollahy, A.K. Darban and G. Hefter

Journal of Chemical & Engineering Data, Vol.63(5), pp.1773-1779

2018

DOI: https://doi.org/10.1021/acs.jced.8b00078

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Abstract

Isobaric volumetric heat capacities of aqueous solutions of K4Fe(CN)6, K3Fe(CN)6, K3Co(CN)6, K2Ni(CN)4, and KAg(CN)2 have been measured at 298.15 K over the approximate concentration range 0.02 to 0.4 mol·kg–1 using a Picker flow calorimeter. These data were combined with measured densities to calculate the corresponding apparent molar isobaric heat capacities, Cpϕ. The values so obtained were fitted as a function of concentration using an extended Redlich–Rosenfeld–Meyer-type equation to provide the standard state (infinite dilution) quantities, Cpϕo, for each salt. The Cpϕ values for all the salts studied showed similar dependences on concentration, with a slight upward curvature at higher molalities, possibly due to anion aggregation. Values of Cpϕo for the aquated cyanometallate anions were estimated using the tetraphenylphosphonium tetraphenylborate extrathermodynamic assumption and were little affected by ion size but were strongly dependent on ionic charge, ranging from −191 J·K–1·mol–1 for [Fe(CN)6]4–(aq) to +178 J·K–1·mol–1 for [Ag(CN)2]−(aq). This indicates that the differences between the anions are mostly due to their effect on the surrounding water molecules.

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Title: Heat Capacities of Aqueous Solutions of K4Fe(CN)6, K3Fe(CN)6, K3Co(CN)6, K2Ni(CN)4, and KAg(CN)2 at 298.15 K
Authors/Creators: Y. Kianinia (Author/Creator) - Tarbiat Modares University
L. Hnědkovský (Author/Creator) - Murdoch University
G. Senanayake (Author/Creator) - Murdoch University
C. Akilan (Author/Creator) - Murdoch University
M.R. Khalesi (Author/Creator) - Tarbiat Modares University
M. Abdollahy (Author/Creator) - Tarbiat Modares University
A.K. Darban (Author/Creator) - Tarbiat Modares University
G. Hefter (Author/Creator) - Murdoch University
Publication Details: Journal of Chemical & Engineering Data, Vol.63(5), pp.1773-1779
Publisher: American Chemical Society
Identifiers: 991005543899807891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.462 Excess Molar Volumes
Web Of Science research areas: Chemistry, Multidisciplinary; Engineering, Chemical; Thermodynamics
ESI research areas: Chemistry