Thermophysics of metal alkanoates IV. Heat capacities and thermodynamic properties of potassium 2-methylpropanoate

The molar heat capacity of potassium 2-methylpropanoate, (CH3)2CHCO2K, has been measured between 8 and 350 K by adiabatic calorimetry, and found to be normal. The corresponding thermodynamic functions have been calculated. The values found at 298.15 K for Cp, m(T)/R, {Smo(T) - Smo(0)}/R, {Hmo(T) - Hmo(0)}/R, and {Gmo(T) - Hmo(0)}/RT are 20.08, 23.14, 3457.3 K, and -11.546, respectively.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/24966/1/0000393.pd

Thermophysics of metal alkanoates VII. Heat capacities and thermodynamic properties of potassium n-butanoate

The subambient heat-capacity curve of potassium n-butanoate as determined by adiabatic equilibrium calorimetry is characterized by a "bifurcated" transition whose "peaks" occur at 123.85 and 142.3 K. The corresponding (Cp, m/R)max, [Delta]trsHmo/R, and [Delta]trsSmo/R, values are 24.1, 23.85; 49.3 K, 32.5 K; and 0.400, 0.226, respectively. Smoothed thermodynamic functions are provided in tabular form from 10 to 350 K.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/26886/1/0000452.pd

Thermophysics of metal alkanoates I. Heat capacities and thermodynamic properties of sodium methanoate and ethanoate

The heat capacities of two sodium alkanoates have been studied by adiabatic calorimetry. Earlier measurements from this laboratory on sodium methanoate between 5 and 350 K are supplemented from 300 K to melting. Sodium ethanoate ismeasured from 7 through 350 K; the results differ markedly from those reported by Strelkov in that we find the 21 K transition peak is much larger and the higher temperature values are 15 to 20 per cent higher and in good accord with reported d.s.c. studies at still higher temperatures. We estimate [Delta]traSmo/R of the 21 K peak to be about 1.5 although no isostructural lattice contribution is available. Even with adjuvant X-ray diffraction results by Hsu and Nordman the mechanism of the transition has not been identified. The 298.15 K values of Cp,m/R, Smo/R, {Hmo-Hmo(0)}/R and {Gmo-Hmo(0)}/RT are 12.127, 16.610, 2308.1 K, and -8.868 for form II CH3COONa.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/25417/1/0000866.pd