Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].

Carbonic acid

Formula: C(O)(OH)2 (aq, undissoc)

CAS RN: 463-79-6

ATcT ID: 463-79-6*1000

SMILES: OC(=O)O

InChI: InChI=1S/CH2O3/c2-1(3)4/h(H2,2,3,4)

InChIKey: BVKZGUZCCUSVTD-UHFFFAOYSA-N

Hills Formula: C1H2O3

2D Image:

Aliases: C(O)(OH)2; Carbonic acid; Acid of air; NSC 81688; OC(OH)2; OHC(O)OH; HOC(O)OH; H2CO3

Relative Molecular Mass: 62.0248 ± 0.0012

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
	-698.669	± 0.028	kJ/mol

Top contributors to the provenance of Δ_fH° of C(O)(OH)2 (aq, undissoc)

The 20 contributors listed below account only for 71.6% of the provenance of Δ_fH° of C(O)(OH)2 (aq, undissoc).
A total of 142 contributors would be needed to account for 90% of the provenance.

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
17.3	125.2	1/2 O2 (g) + H2 (g) → H2O (cr,l)	Δ_rH°(298.15 K) = -285.8261 ± 0.040 kJ/mol	Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930
10.8	3219.14	CO2 (g) → CO2 (aq, undissoc)	Δ_rG°(298.15 K) = 2.008 ± 0.003 kcal/mol	Berg 1978a
8.4	2376.1	2 H2 (g) + C (graphite) → CH4 (g)	Δ_rG°(1165 K) = 37.521 ± 0.068 kJ/mol	Smith 1946, note COf, 3rd Law
7.2	2228.7	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.464 ± 0.024 kJ/mol	Hawtin 1966, note CO2e
6.5	2374.7	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.578 ± 0.078 kJ/mol	Schley 2010
2.8	2228.4	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.462 ± 0.038 kJ/mol	Lewis 1965, note CO2d
2.8	2228.5	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.468 ± 0.038 kJ/mol	Fraser 1952, note CO2f
2.7	3219.12	CO2 (g) → CO2 (aq, undissoc)	Δ_rG°(298.15 K) = 2.009 ± 0.006 kcal/mol	Hu 1972a, Berg 1978a, est unc
1.9	2228.11	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -94.051 ± 0.011 kcal/mol	Prosen 1944a, Cox 1970, NBS TN270, NBS Tables 1989
1.3	2228.6	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.462 ± 0.056 kJ/mol	Hawtin 1966, note CO2e
1.2	115.11	H2O (g) → O (g) + 2 H (g)	Δ_rH°(0 K) = 917.80 ± 0.15 kJ/mol	Thorpe 2021
1.1	157.1	OH (g) → [OH]+ (g)	Δ_rH°(0 K) = 104989 ± 5 (×2.327) cm-1	Wiedmann 1992, note unc
1.0	2228.2	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(298.15 K) = -393.498 ± 0.062 kJ/mol	Dewey 1938, note CO2, Rossini 1938, note CO2c
1.0	2228.3	C (graphite) + O2 (g) → CO2 (g)	Δ_rH°(303.15 K) = -393.447 ± 0.064 kJ/mol	Jessup 1938, note CO2a, Rossini 1938, note CO2c
0.9	167.6	H2O (g) → [OH]+ (g) + H (g)	Δ_rH°(0 K) = 18.1183 ± 0.0015 (×1.044) eV	Bodi 2014
0.9	2374.4	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.61 ± 0.21 kJ/mol	Dale 2002
0.8	152.1	OH (g) → O (g) + H (g)	Δ_rH°(0 K) = 35580 ± 15 cm-1	Sun 2020
0.8	1731.1	N2 (g) + 3 H2O (cr,l) + 2 H+ (aq) → 3/2 O2 (g) + 2 [NH4]+ (aq)	Δ_rH°(298.15 K) = 141.292 ± 0.119 kcal/mol	Vanderzee 1972c
0.7	169.1	[OH]- (g) → O- (g) + H (g)	Δ_rH°(0 K) = 4.7796 ± 0.0010 (×2.044) eV	Martin 2001, est unc
0.6	3219.1	CO2 (g) → CO2 (aq, undissoc)	Δ_rG°(298.15 K) = 8.381 ± 0.05 kJ/mol	Scharlin 1996, Carroll 1991, est unc

Top 10 species with enthalpies of formation correlated to the Δ_fH° of C(O)(OH)2 (aq, undissoc)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
76.2	Water	H2O (cr,l)	-286.273	-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
76.2	Water	H2O (l)		-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
76.2	Oxonium	[H3O]+ (aq)		-285.801	± 0.022	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
76.2	Water	H2O (l, eq.press.)		-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*589
76.2	Water	H2O (cr, l, eq.press.)	-286.275	-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*499
76.1	Water	H2O (g, ortho)	-238.618	-241.806	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*1
76.1	Water	H2O (g, para)	-238.903	-241.806	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*2
76.1	Water	H2O (g)	-238.903	-241.806	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
76.1	Water	H2O (cr)	-286.273	-292.713	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*510
76.1	Water	H2O (cr, eq.press.)	-286.275	-292.715	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*509

Most Influential reactions involving C(O)(OH)2 (aq, undissoc)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
1.000	3218.1	CO2 (aq, undissoc) + H2O (cr,l) → C(O)(OH)2 (aq, undissoc)	Δ_rH°(298.15 K) = 0 ± 0 cm-1	triv

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		B. Ruscic and D. H. Bross Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry Faraday Discuss. (in press) (2024) [DOI: 10.1039/D4FD00110A]
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.