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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Condensed phase thermochemistry data
Go To: Top, Phase change data, References, Notes
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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°solid,1 bar | 211.52 | J/mol*K | N/A | Franzosini, Ngeyi, et al., 1987 |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 157.97 | 298.15 | Franzosini, Ngeyi, et al., 1987 | T = 10 to 350 K. |
Phase change data
Go To: Top, Condensed phase thermochemistry data, References, Notes
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
Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes
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, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) 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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