1,2,3-Propanetricarboxylic acid, 2-hydroxy-, hydrate (1:1)
- Formula: C6H8O7·H2O
- Molecular weight: 210.1388
- IUPAC Standard InChI: InChI=1S/C6H8O7.H2O/c7-3(8)1-6(13,5(11)12)2-4(9)10;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);1H2
- IUPAC Standard InChIKey: YASYEJJMZJALEJ-UHFFFAOYSA-N
- CAS Registry Number: 5949-29-1
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Citric acid monohydrate; 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, monohydrate; Citric acid monohydrat; citric acid
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
Condensed phase thermochemistry data
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -439.2 | kcal/mol | Ccb | Chappel and Hoare, 1958 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -466.6 | kcal/mol | Ccb | Chappel and Hoare, 1958 | Corresponding ΔfHºsolid = -439.3 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 67.76 | cal/mol*K | N/A | Evans, Hoare, et al., 1962 | DH |
| S°solid,1 bar | 68.193 | cal/mol*K | N/A | De Kruif, Van Miltenburg, et al., 1982 | DH |
Constant pressure heat capacity of solid
| Cp,solid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 64.417 | 300. | De Kruif, Van Miltenburg, et al., 1982 | T = 120 to 300 K.; DH |
| 64.08 | 298.15 | Evans, Hoare, et al., 1962 | T = 21 to 303 K.; DH |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chappel and Hoare, 1958
Chappel, F.P.; Hoare, F.E.,
The heat of combustion of citric acid monohydrate,
Trans. Faraday Soc., 1958, 54, 367-371. [all data]
Evans, Hoare, et al., 1962
Evans, D.M.; Hoare, F.E.; Melia, T.P.,
Heat capacity, enthalpy and entropy of citric acid monohydrate,
Trans. Faraday Soc., 1962, 58, 1511-1514. [all data]
De Kruif, Van Miltenburg, et al., 1982
De Kruif, C.G.; Van Miltenburg, J.C.; Sprenkels, A.J.J.; Stevens, G.,
Thermodynamic properties of citric acid and the system citric acid-water,
Thermochim. Acta, 1982, 58, 341-354. [all data]
Notes
Go To: Top, Condensed phase thermochemistry 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) ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.