Thioacetic acid
- Formula: C2H4OS
- Molecular weight: 76.118
- IUPAC Standard InChI: InChI=1S/C2H4OS/c1-2(3)4/h1H3,(H,3,4)
- IUPAC Standard InChIKey: DUYAAUVXQSMXQP-UHFFFAOYSA-N
- CAS Registry Number: 507-09-5
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Methanecarbothiolic acid; Thioacetic S-acid; Ethanethioic acid; Acetyl mercaptan; Ethanethiolic acid; Thiacetic acid; Thiolacetic acid; Thionoacetic acid; CH3COSH; Kyselina thiooctova; UN 2436; USAF EK-P-737; Acetic acid, thio-
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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: William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 8.41 | 333. | Dykyj, Svoboda, et al., 1999 | Based on data from 307. to 360. K. |
Reaction 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: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
=
+
By formula: C4H6O2S = C2H2O + C2H4OS
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 22.6 | kcal/mol | Eqk | Blake and Speis, 1974 | gas phase; Heat of formation derived by 77PED/RYL |
+
=
+
By formula: C2H4OS + H2O = C2H4O2 + H2S
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -0.64 ± 0.07 | kcal/mol | Cm | Sunner and Wadso, 1957 | liquid phase; Heat of hydrolysis |
+
=
By formula: C2H4OS + C3H6O = C5H10O2S
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -6.5 ± 0.2 | kcal/mol | Eqk | Horii, Kawamura, et al., 1972 | liquid phase; solvent: CD3COCD3; NMR |
+
=
By formula: C2H2O + C2H4OS = C4H6O2S
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -22.6 | kcal/mol | Eqk | Blake and Speis, 1974 | gas phase |
References
Go To: Top, Phase change data, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Dykyj, Svoboda, et al., 1999
Dykyj, J.; Svoboda, J.; Wilhoit, R.C.; Frenkel, M.L.; Hall, K.R.,
Vapor Pressure of Chemicals: Part A. Vapor Pressure and Antoine Constants for Hydrocarbons and Sulfur, Selenium, Tellurium and Hydrogen Containing Organic Compounds, Springer, Berlin, 1999, 373. [all data]
Blake and Speis, 1974
Blake, P.G.; Speis, A.,
Reactions of keten. Part IV. Kinetics and thermodynamics of the gas-phase reaction: Thioacetic acid + keten = acetic Thioanhydride,
J. Chem. Soc. Perkin Trans. 2, 1974, 1879-1881. [all data]
Sunner and Wadso, 1957
Sunner, S.; Wadso, I.,
The heat of hydrolysis of thiolacetic acid,
Trans. Faraday Soc., 1957, 53, 455-459. [all data]
Horii, Kawamura, et al., 1972
Horii, T.; Kawamura, S.; Tsurugi, J.,
A NMR study of the thioacetic acid-acetone mixture,
Bull. Chem. Soc. Jpn., 1972, 45, 2200-2202. [all data]
Notes
Go To: Top, Phase change data, Reaction thermochemistry data, References
- Symbols used in this document:
ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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