Potassium hydroxide
- Formula: HKO
- Molecular weight: 56.1056
- IUPAC Standard InChI: InChI=1S/K.H2O/h;1H2/q+1;/p-1
- IUPAC Standard InChIKey: KWYUFKZDYYNOTN-UHFFFAOYSA-M
- CAS Registry Number: 1310-58-3
- Chemical structure:
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Gas 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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -232.63 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1970 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 236.41 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1970 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 2000. to 6000. |
|---|---|
| A | 49.48500 |
| B | 7.051337 |
| C | -1.412548 |
| D | 0.097243 |
| E | -0.245887 |
| F | -248.5150 |
| G | 292.8666 |
| H | -232.6304 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1970 |
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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -412.71 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1970 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 96.62 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1970 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -424.72 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1970 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 78.90 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1970 |
Liquid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 679. to 2000. |
|---|---|
| A | 83.10721 |
| B | -2.329778×10-9 |
| C | 1.884198×10-9 |
| D | -4.813735×10-10 |
| E | -3.556267×10-11 |
| F | -437.4832 |
| G | 197.1894 |
| H | -412.7056 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1970 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 516. | 516. to 679. |
|---|---|---|
| A | 80.78258 | 78.65920 |
| B | -112.2329 | 0.000000 |
| C | 301.1543 | 0.000000 |
| D | -147.9923 | 0.000000 |
| E | -0.468867 | 0.000000 |
| F | -447.7591 | -443.0814 |
| G | 195.4108 | 182.7734 |
| H | -424.7178 | -424.7178 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1970 | Data last reviewed in December, 1970 |
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.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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| Temperature (K) | A | B | C | Reference | Comment |
|---|---|---|---|---|---|
| 992. to 1600. | 4.02783 | 5854.906 | -144.113 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Gas phase ion energetics 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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Proton affinity (review) | 1101.8 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 1075.4 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 7.5 ± 1.0 | S | Farber, Srivastava, et al., 1982 | LBLHLM |
| 7.50 ± 0.15 | EI | Gorokhov, Gusarov, et al., 1970 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| K+ | 7.80 ± 0.15 | OH | EI | Gorokhov, Gusarov, et al., 1970 | RDSH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, NIST Free Links, NIST Subscription Links, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Farber, Srivastava, et al., 1982
Farber, M.; Srivastava, R.D.; Moyer, J.W.,
Mass spectrometric determination of the thermodynamics of potassium hydroxide and minor potassium-containing species required in magnetohydrodynamic power systems,
J. Chem. Thermodyn., 1982, 14, 1103. [all data]
Gorokhov, Gusarov, et al., 1970
Gorokhov, L.N.; Gusarov, A.V.; Panchenkov, I.G.,
Determination of dissociation energies of potassium and caesium hydroxides by electron bombardment,
Zh. Fiz. Khim., 1970, 44, 269, In original 150. [all data]
Notes
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- Symbols used in this document:
AE Appearance energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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