Molar Volumes and Heat Capacities of Aqueous Solutions of Short-Chain Aliphatic Sodium Carboxylates at 25 °C

S. Bochmann; P.M. May; G. Hefter

doi:10.1021/je200964m

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Molar Volumes and Heat Capacities of Aqueous Solutions of Short-Chain Aliphatic Sodium Carboxylates at 25 °C

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Molar Volumes and Heat Capacities of Aqueous Solutions of Short-Chain Aliphatic Sodium Carboxylates at 25 °C

S. Bochmann, P.M. May and G. Hefter

Journal of Chemical & Engineering Data, Vol.56(12), pp.5081-5087

2011

DOI: https://doi.org/10.1021/je200964m

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Abstract

Densities and isobaric heat capacities of the aqueous solutions of the sodium salts of the four smallest straight-chain aliphatic carboxylates: sodium methanoate (formate), ethanoate (acetate) n-propanoate, and n-butanoate have been measured at 25 degrees C and 0.1 MPa by vibrating-tube densimetry and Picker flow calorimetry, respectively. All systems were investigated at concentrations ranging from approximately 0.02 mol.kg(-1) near saturation, which extends the existing database to higher concentrations for all of these salts. Apparent molar isobaric heat capacities and volumes derived from the data were fitted with an extended Redlich-Meyer equation to determine the standard state partial molar quantities. At concentrations where comparisons were possible, the present results generally agreed well with previous determinations. An exception was the heat capacities of sodium formate solutions, where the present results at low solute concentrations appear to be influenced by an unidentified thermal effect. The apparent molar quantities, especially the heat capacities, provide indirect evidence of aggregation by the longer-chain aliphatic carboxylates at high concentrations.

Details

Title: Molar Volumes and Heat Capacities of Aqueous Solutions of Short-Chain Aliphatic Sodium Carboxylates at 25 °C
Authors/Creators: S. Bochmann (Author/Creator)
P.M. May (Author/Creator)
G. Hefter (Author/Creator)
Publication Details: Journal of Chemical & Engineering Data, Vol.56(12), pp.5081-5087
Publisher: American Chemical Society
Identifiers: 991005544067907891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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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