potassium butyrate
- Formula: C4H7KO2
- Molecular weight: 126.1955
- IUPAC Standard InChI: InChI=1S/C4H8O2.K/c1-2-3-4(5)6;/h2-3H2,1H3,(H,5,6);/q;+1/p-1
- IUPAC Standard InChIKey: RWMKSKOZLCXHOK-UHFFFAOYSA-M
- CAS Registry Number: 589-39-9
- Chemical structure:
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Phase change data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing
Temperature of phase transition
| Ttrs (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|
| 461.4 | crystaline, V | crystaline, IV | Franzosini, Ngeyi, et al., 1987 | |
| 467.2 | crystaline, IV | crystaline, III | Franzosini, Ngeyi, et al., 1987 | |
| 541. | crystaline, III | crystaline, II | Franzosini, Ngeyi, et al., 1987 | |
| 562.2 | crystaline, II | crystaline, I | Franzosini, Ngeyi, et al., 1987 | |
| 461.4 | crystaline, V | crystaline, IV | Ferloni and Franzosini, 1975 | |
| 540.8 | crystaline, III | crystaline, II | Ferloni and Franzosini, 1975 |
Enthalpy of phase transition
| ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 0.409 | 123.85 | crystaline, VII | crystaline, VI | Franzosini, Ngeyi, et al., 1987 | |
| 0.269 | 142.3 | crystaline, VI | crystaline, VB | Franzosini, Ngeyi, et al., 1987 | Bifurcated transitions. |
| 1.172 | 467.2 | crystaline, IV | crystaline, III | Ferloni and Franzosini, 1975 | Combined values. |
| 4.435 | 562.2 | crystaline, II | crystaline, I | Ferloni and Franzosini, 1975 | Combined values. |
| 10.837 | 626.1 | crystaline, I | liquid | Ferloni and Franzosini, 1975 | |
| 0.670 | 133. | crystaline, VII | crystaline, V | Ferloni, Sanesi, et al., 1975 | Taken as sum of data for transitions at 123 K and 143 K at average temperature. |
Entropy of phase transition
| ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 3.33 | 123.85 | crystaline, VII | crystaline, VI | Franzosini, Ngeyi, et al., 1987 | |
| 1.88 | 142.3 | crystaline, VI | crystaline, VB | Franzosini, Ngeyi, et al., 1987 | Bifurcated |
| 2.51 | 467.2 | crystaline, IV | crystaline, III | Ferloni and Franzosini, 1975 | Combined |
| 8.03 | 562.2 | crystaline, II | crystaline, I | Ferloni and Franzosini, 1975 | Combined |
| 17.32 | 626.1 | crystaline, I | liquid | Ferloni and Franzosini, 1975 | |
| 5.0 | 133. | crystaline, VII | crystaline, V | Ferloni, Sanesi, et al., 1975 | Taken |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Franzosini, Ngeyi, et al., 1987
Franzosini, P.; Ngeyi, S.P.; Westrum, E.F.,
Jr., Thermophysics of metal alkanoates. VII. Heat capacities and thermodynamic properties of potassium n-butanoate,
J. Chem Thermodynam., 1987, 19, 113-123. [all data]
Ferloni and Franzosini, 1975
Ferloni, P.; Franzosini, P.,
Calorimetric study of sodium and potassium n-butyrates,
Gazz. Chim. Ital., 1975, 105, 391-401. [all data]
Ferloni, Sanesi, et al., 1975
Ferloni, P.; Sanesi, M.; Franzosini, P.; C4 alkanoates, Phase transitions in the alkali C1-n.,
Z. Naturforsch. 30a, 1975, 1447-1454. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Ttrs Temperature of phase transition ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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