potassium

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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
Δfgas89.0 ± 0.8kJ/molReviewCox, Wagman, et al., 1984CODATA Review value
Δfgas89.00kJ/molReviewChase, 1998Data last reviewed in December, 1961
Quantity Value Units Method Reference Comment
gas,1 bar160.341 ± 0.003J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar160.34J/mol*KReviewChase, 1998Data last reviewed in December, 1961

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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View table.

Temperature (K) 1039.54 - 1800.1800. - 6000.
A 20.6612258.70570
B 0.391869-27.38277
C -0.4173446.730509
D 0.145582-0.420844
E 0.003764-25.87921
F 82.8386032.37931
G 185.2650198.3777
H 88.9999688.99996
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1961 Data last reviewed in December, 1961

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
Δfliquid2.27kJ/molReviewChase, 1998Data last reviewed in December, 1961
Quantity Value Units Method Reference Comment
liquid,1 bar71.40J/mol*KReviewChase, 1998Data last reviewed in December, 1961
Quantity Value Units Method Reference Comment
solid,1 bar64.68 ± 0.20J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
solid64.63J/mol*KReviewChase, 1998Data last reviewed in December, 1961

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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View table.

Temperature (K) 336.35 - 1039.54
A 40.27113
B -30.54542
C 26.49505
D -5.727854
E -0.063477
F -8.812467
G 127.7614
H 2.270005
ReferenceChase, 1998
Comment Data last reviewed in December, 1961

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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View table.

Temperature (K) 298. - 336.35
A -63.47410
B -3226.340
C 14644.60
D -16229.50
E 16.29410
F 119.6480
G 533.8780
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in December, 1961

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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director

Quantity Value Units Method Reference Comment
Tboil1037.KN/AHonig and Kramer, 1969Uncertainty assigned by TRC = 1. K; TRC
Quantity Value Units Method Reference Comment
Ttriple336.35KN/AHonig and Kramer, 1969Uncertainty assigned by TRC = 0.1 K; TRC

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
679.4 - 1033.04.457184691.5824.195Fiock and Rodebush, 1926Coefficents calculated by NIST from author's data.

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, 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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

(Potassium ion (1+) • 10potassium) + potassium = (Potassium ion (1+) • 11potassium)

By formula: (K+ • 10K) + K = (K+ • 11K)

Quantity Value Units Method Reference Comment
Δr54.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 11potassium) + potassium = (Potassium ion (1+) • 12potassium)

By formula: (K+ • 11K) + K = (K+ • 12K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 12potassium) + potassium = (Potassium ion (1+) • 13potassium)

By formula: (K+ • 12K) + K = (K+ • 13K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 13potassium) + potassium = (Potassium ion (1+) • 14potassium)

By formula: (K+ • 13K) + K = (K+ • 14K)

Quantity Value Units Method Reference Comment
Δr62.3kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 14potassium) + potassium = (Potassium ion (1+) • 15potassium)

By formula: (K+ • 14K) + K = (K+ • 15K)

Quantity Value Units Method Reference Comment
Δr54.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 15potassium) + potassium = (Potassium ion (1+) • 16potassium)

By formula: (K+ • 15K) + K = (K+ • 16K)

Quantity Value Units Method Reference Comment
Δr62.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 16potassium) + potassium = (Potassium ion (1+) • 17potassium)

By formula: (K+ • 16K) + K = (K+ • 17K)

Quantity Value Units Method Reference Comment
Δr64.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 17potassium) + potassium = (Potassium ion (1+) • 18potassium)

By formula: (K+ • 17K) + K = (K+ • 18K)

Quantity Value Units Method Reference Comment
Δr67.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 18potassium) + potassium = (Potassium ion (1+) • 19potassium)

By formula: (K+ • 18K) + K = (K+ • 19K)

Quantity Value Units Method Reference Comment
Δr65.7kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 19potassium) + potassium = (Potassium ion (1+) • 20potassium)

By formula: (K+ • 19K) + K = (K+ • 20K)

Quantity Value Units Method Reference Comment
Δr72.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 20potassium) + potassium = (Potassium ion (1+) • 21potassium)

By formula: (K+ • 20K) + K = (K+ • 21K)

Quantity Value Units Method Reference Comment
Δr54.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 21potassium) + potassium = (Potassium ion (1+) • 22potassium)

By formula: (K+ • 21K) + K = (K+ • 22K)

Quantity Value Units Method Reference Comment
Δr59.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 22potassium) + potassium = (Potassium ion (1+) • 23potassium)

By formula: (K+ • 22K) + K = (K+ • 23K)

Quantity Value Units Method Reference Comment
Δr56.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 23potassium) + potassium = (Potassium ion (1+) • 24potassium)

By formula: (K+ • 23K) + K = (K+ • 24K)

Quantity Value Units Method Reference Comment
Δr61.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 9potassium) + potassium = (Potassium ion (1+) • 10potassium)

By formula: (K+ • 9K) + K = (K+ • 10K)

Quantity Value Units Method Reference Comment
Δr54.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 2potassium) + potassium = (Potassium ion (1+) • 3potassium)

By formula: (K+ • 2K) + K = (K+ • 3K)

Quantity Value Units Method Reference Comment
Δr43.5kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 3potassium) + potassium = (Potassium ion (1+) • 4potassium)

By formula: (K+ • 3K) + K = (K+ • 4K)

Quantity Value Units Method Reference Comment
Δr64.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 4potassium) + potassium = (Potassium ion (1+) • 5potassium)

By formula: (K+ • 4K) + K = (K+ • 5K)

Quantity Value Units Method Reference Comment
Δr52.3kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 5potassium) + potassium = (Potassium ion (1+) • 6potassium)

By formula: (K+ • 5K) + K = (K+ • 6K)

Quantity Value Units Method Reference Comment
Δr72.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 6potassium) + potassium = (Potassium ion (1+) • 7potassium)

By formula: (K+ • 6K) + K = (K+ • 7K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 7potassium) + potassium = (Potassium ion (1+) • 8potassium)

By formula: (K+ • 7K) + K = (K+ • 8K)

Quantity Value Units Method Reference Comment
Δr87.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 8potassium) + potassium = (Potassium ion (1+) • 9potassium)

By formula: (K+ • 8K) + K = (K+ • 9K)

Quantity Value Units Method Reference Comment
Δr48.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, NIST Free Links, References, Notes

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:
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to K+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)4.34066 ± 0.00001eVN/AN/AL

Ionization energy determinations

IE (eV) Method Reference Comment
4.34066EVALLide, 1992LL
4.34066SKelly, 1987LBLHLM
4.34066 ± 0.00001SSugar and Corliss, 1985LBLHLM
4.5 ± 1.0SFarber, Srivastava, et al., 1982LBLHLM
4.4EIZmbov, Wu, et al., 1977LLK
4.1 ± 0.3EISimmons, Lowden, et al., 1977LLK
4.34PEWilliams and Potts, 1976LLK
4.34066SMoore, 1970RDSH

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, NIST Free Links, 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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

(Potassium ion (1+) • 2potassium) + potassium = (Potassium ion (1+) • 3potassium)

By formula: (K+ • 2K) + K = (K+ • 3K)

Quantity Value Units Method Reference Comment
Δr43.5kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 3potassium) + potassium = (Potassium ion (1+) • 4potassium)

By formula: (K+ • 3K) + K = (K+ • 4K)

Quantity Value Units Method Reference Comment
Δr64.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 4potassium) + potassium = (Potassium ion (1+) • 5potassium)

By formula: (K+ • 4K) + K = (K+ • 5K)

Quantity Value Units Method Reference Comment
Δr52.3kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 5potassium) + potassium = (Potassium ion (1+) • 6potassium)

By formula: (K+ • 5K) + K = (K+ • 6K)

Quantity Value Units Method Reference Comment
Δr72.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 6potassium) + potassium = (Potassium ion (1+) • 7potassium)

By formula: (K+ • 6K) + K = (K+ • 7K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 7potassium) + potassium = (Potassium ion (1+) • 8potassium)

By formula: (K+ • 7K) + K = (K+ • 8K)

Quantity Value Units Method Reference Comment
Δr87.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 8potassium) + potassium = (Potassium ion (1+) • 9potassium)

By formula: (K+ • 8K) + K = (K+ • 9K)

Quantity Value Units Method Reference Comment
Δr48.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 9potassium) + potassium = (Potassium ion (1+) • 10potassium)

By formula: (K+ • 9K) + K = (K+ • 10K)

Quantity Value Units Method Reference Comment
Δr54.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 10potassium) + potassium = (Potassium ion (1+) • 11potassium)

By formula: (K+ • 10K) + K = (K+ • 11K)

Quantity Value Units Method Reference Comment
Δr54.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 11potassium) + potassium = (Potassium ion (1+) • 12potassium)

By formula: (K+ • 11K) + K = (K+ • 12K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 12potassium) + potassium = (Potassium ion (1+) • 13potassium)

By formula: (K+ • 12K) + K = (K+ • 13K)

Quantity Value Units Method Reference Comment
Δr56.1kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 13potassium) + potassium = (Potassium ion (1+) • 14potassium)

By formula: (K+ • 13K) + K = (K+ • 14K)

Quantity Value Units Method Reference Comment
Δr62.3kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 14potassium) + potassium = (Potassium ion (1+) • 15potassium)

By formula: (K+ • 14K) + K = (K+ • 15K)

Quantity Value Units Method Reference Comment
Δr54.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 15potassium) + potassium = (Potassium ion (1+) • 16potassium)

By formula: (K+ • 15K) + K = (K+ • 16K)

Quantity Value Units Method Reference Comment
Δr62.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 16potassium) + potassium = (Potassium ion (1+) • 17potassium)

By formula: (K+ • 16K) + K = (K+ • 17K)

Quantity Value Units Method Reference Comment
Δr64.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 17potassium) + potassium = (Potassium ion (1+) • 18potassium)

By formula: (K+ • 17K) + K = (K+ • 18K)

Quantity Value Units Method Reference Comment
Δr67.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 18potassium) + potassium = (Potassium ion (1+) • 19potassium)

By formula: (K+ • 18K) + K = (K+ • 19K)

Quantity Value Units Method Reference Comment
Δr65.7kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 19potassium) + potassium = (Potassium ion (1+) • 20potassium)

By formula: (K+ • 19K) + K = (K+ • 20K)

Quantity Value Units Method Reference Comment
Δr72.4kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 20potassium) + potassium = (Potassium ion (1+) • 21potassium)

By formula: (K+ • 20K) + K = (K+ • 21K)

Quantity Value Units Method Reference Comment
Δr54.0kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 21potassium) + potassium = (Potassium ion (1+) • 22potassium)

By formula: (K+ • 21K) + K = (K+ • 22K)

Quantity Value Units Method Reference Comment
Δr59.8kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 22potassium) + potassium = (Potassium ion (1+) • 23potassium)

By formula: (K+ • 22K) + K = (K+ • 23K)

Quantity Value Units Method Reference Comment
Δr56.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

(Potassium ion (1+) • 23potassium) + potassium = (Potassium ion (1+) • 24potassium)

By formula: (K+ • 23K) + K = (K+ • 24K)

Quantity Value Units Method Reference Comment
Δr61.9kJ/molPDissBrechignac, Cahuzac, et al., 1990gas phase

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Honig and Kramer, 1969
Honig, R.E.; Kramer, D.A., Vapor pressure data for the solid and liquid elements, RCA Rev., 1969, 1969, 285. [all data]

Fiock and Rodebush, 1926
Fiock, E.F.; Rodebush, W.H., The Vapor Pressures and Thermal Properties of Potassium and Some Alkali Halides, J. Am. Chem. Soc., 1926, 48, 10, 2522-2528, https://doi.org/10.1021/ja01421a006 . [all data]

Brechignac, Cahuzac, et al., 1990
Brechignac, C.; Cahuzac, P.; Carlier, F.; De Frutos, M.; Leyniger, J., Cohesive Energies of (K)n+ 5<n<200 from Photoevaporation Experiments, J. Chem. Phys., 1990, 93, 10, 7449, https://doi.org/10.1063/1.459418 . [all data]

Lide, 1992
Lide, D.R. (Editor), Ionization potentials of atoms and atomic ions in Handbook of Chem. and Phys., 1992, 10-211. [all data]

Kelly, 1987
Kelly, R.L., Atomic and ionic spectrum lines of hydrogen through kryton, J. Phys. Chem. Ref. Data, 1987, 16. [all data]

Sugar and Corliss, 1985
Sugar, J.; Corliss, C., Atomic energy levels of the iron period elements: Potassium through nickel, J. Phys. Chem. Ref. Data, 1985, 14. [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]

Zmbov, Wu, et al., 1977
Zmbov, K.F.; Wu, C.H.; Ihle, H.R., A mass spectrometric study of heteronuclear diatomic alkali metal molecules. Dissociation energies ionization potentials of NaLi, KLi, NaK, J. Chem. Phys., 1977, 67, 4603. [all data]

Simmons, Lowden, et al., 1977
Simmons, L.L.; Lowden, L.F.; Ehlert, T.C., A mass spectrometric study of K2CO3 and K2O, J. Phys. Chem., 1977, 81, 706. [all data]

Williams and Potts, 1976
Williams, T.A.; Potts, A.W., Complexities in the HeI photoelectron spectra of alkali metal vapours, J. Electron Spectrosc. Relat. Phenom., 1976, 8, 331. [all data]

Moore, 1970
Moore, C.E., Ionization potentials and ionization limits derived from the analyses of optical spectra, Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References