H2PO4 anion
- Formula: H2O4P-
- Molecular weight: 96.9878
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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: John E. Bartmess
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Individual Reactions
H2O4P- + =
By formula: H2O4P- + H+ = H3O4P
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 330.5 ± 5.0 | kcal/mol | G+TS | Morris, Knighton, et al., 1997 | gas phase; Between HCl, HBr. For neutral heat, ΔHvap=3/2*H2SO4, plus ΔHf(liquid) |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 323.0 ± 4.9 | kcal/mol | IMRB | Morris, Knighton, et al., 1997 | gas phase; Between HCl, HBr. For neutral heat, ΔHvap=3/2*H2SO4, plus ΔHf(liquid) |
Gas phase ion energetics data
Go To: Top, Reaction 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: John E. Bartmess
Electron affinity of neutral species
| EAneutral (eV) | Method | Reference | Comment |
|---|---|---|---|
| 4.570 ± 0.010 | LPES | Wang, Vorpagel, et al., 2001 | Vertical Detachment Energy = 5.06±0.05 eV |
Protonation reactions
H2O4P- + =
By formula: H2O4P- + H+ = H3O4P
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 330.5 ± 5.0 | kcal/mol | G+TS | Morris, Knighton, et al., 1997 | gas phase; Between HCl, HBr. For neutral heat, ΔHvap=3/2*H2SO4, plus ΔHf(liquid) |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 323.0 ± 4.9 | kcal/mol | IMRB | Morris, Knighton, et al., 1997 | gas phase; Between HCl, HBr. For neutral heat, ΔHvap=3/2*H2SO4, plus ΔHf(liquid) |
References
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Morris, Knighton, et al., 1997
Morris, R.A.; Knighton, W.B.; Viggiano, A.A.; Hoffman, B.C.; Schaeffer III, H.F.,
The Gas-phase Acidity of H3PO4,
J. Chem. Phys., 1997, 106, 9, 3545, https://doi.org/10.1063/1.473465
. [all data]
Wang, Vorpagel, et al., 2001
Wang, X.B.; Vorpagel, E.R.; Yang, X.; Wang, L.S.,
Experimental and theoretical investigations of the stability, energetics, and structures, of H2PO4-, H2P2O72-, and H3P3O102- in the gas phase,
J. Phys. Chem. A, 2001, 105, 45, 10468-10474, https://doi.org/10.1021/jp013244u
. [all data]
Notes
Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
EAneutral Electron affinity of neutral species ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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