Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, potassium sodium salt, hydrate (1:1:1:4)
- Formula: C4H4KNaO6·H8O4
- Molecular weight: 282.2201
- IUPAC Standard InChI: InChI=1S/C4H6O6.K.Na.4H2O/c5-1(3(7)8)2(6)4(9)10;;;;;;/h1-2,5-6H,(H,7,8)(H,9,10);;;4*1H2/q;2*+1;;;;/p-2
- IUPAC Standard InChIKey: VZOPRCCTKLAGPN-UHFFFAOYSA-L
- CAS Registry Number: 6381-59-5
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Potassium sodium tartrate tetra hydrate; Sodium potassium tartrate tetrahydrate
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Condensed phase thermochemistry 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
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 92.287 | 298.15 | Tatsumi, Matsuo, et al., 1978 | T = 190 to 308 K. |
| 93.00 | 300. | Hicks and Hooley, 1938 | T = 15 to 340 K. |
| 92.23 | 298.15 | Wilson, 1938 | T = 243 to 303 K. Cp(c) = 1.290 + 0.0031t/°C J/g (243 to 303 K), large single cystals. Cp(298.15 K) = 387.8 J/mol*K, Cp = 1.289 + 0.0034t/°C J/g (243 to 303 K), crystalline powder. |
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 |
|---|---|---|---|---|
| 212. | crystaline, IV | crystaline, III | Dey, Som, et al., 1993 | |
| 256. | crystaline, III | crystaline, II | Dey, Som, et al., 1993 | |
| 297. | crystaline, II | crystaline, I | Dey, Som, et al., 1993 |
Enthalpy of phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 10.218 | 328.78 | crystaline, II | crystaline, I | Hicks and Hooley, 1938 |
Entropy of phase transition
| ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 31.07 | 328.78 | crystaline, II | crystaline, I | Hicks and Hooley, 1938 |
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.
Tatsumi, Matsuo, et al., 1978
Tatsumi, M.; Matsuo, T.; Suga, H.; Seki, S.,
Phase transitions of Rochelle salt as studied by high-resolution heat capacity measurements,
J. Phys. Chem. Solids, 1978, 39, 427-434. [all data]
Hicks and Hooley, 1938
Hicks, J.F.G., Jr.; Hooley, J.G.,
The heat capacity of potassium sodium tartrate tetrahydrate from 15 to 340°K,
J. Am. Chem. Soc., 1938, 60, 2994-2997. [all data]
Wilson, 1938
Wilson, A.J.C.,
The heat capacity of Rochelle Salt between -30° and +30°C,
Phys. Rev., 1938, 54, 1103-1109. [all data]
Dey, Som, et al., 1993
Dey, P.K.; Som, K.K.; Chowdhury, K.R.; Sarkar, B.K.; Chaudhuri, B.K.,
Heat capacity anomalies in Rochelle salt (NaKC4H6O6x4H2O) studied with a conduction-type calorimeter, 1993, Phys. [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 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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