potassium hydride
- Formula: HK
- Molecular weight: 40.1062
- IUPAC Standard InChI: InChI=1S/K.H
- IUPAC Standard InChIKey: NTTOTNSKUYCDAV-UHFFFAOYSA-N
- CAS Registry Number: 7693-26-7
- 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 | 29.400 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1963 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 47.328 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1963 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1100. | 1100. to 6000. |
|---|---|---|
| A | 5.545290 | 8.903719 |
| B | 8.143719 | 0.244544 |
| C | -7.106062 | -0.004337 |
| D | 2.278521 | 0.000300 |
| E | 0.001272 | -0.280750 |
| F | 27.44720 | 25.95880 |
| G | 51.91401 | 56.88069 |
| H | 29.40010 | 29.40010 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1963 | Data last reviewed in March, 1963 |
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°solid | -13.82 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1963 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 11.99 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1963 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1500. |
|---|---|
| A | 6.759750 |
| B | 14.47600 |
| C | -8.702281 |
| D | 1.896691 |
| E | -0.114805 |
| F | -16.79260 |
| G | 15.58200 |
| H | -13.81930 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1963 |
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
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
K- + =
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 344.130 ± 0.010 | kcal/mol | D-EA | Andersson, Sandstrom, et al., 2000 | gas phase; Given: 0.501459(12) eV |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 339.48 ± 0.30 | kcal/mol | H-TS | Andersson, Sandstrom, et al., 2000 | gas phase; Given: 0.501459(12) eV |
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 compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 8.0 ± 1.0 | S | Farber, Srivastava, et al., 1982 | LBLHLM |
De-protonation reactions
K- + =
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 344.130 ± 0.010 | kcal/mol | D-EA | Andersson, Sandstrom, et al., 2000 | gas phase; Given: 0.501459(12) eV; B |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 339.48 ± 0.30 | kcal/mol | H-TS | Andersson, Sandstrom, et al., 2000 | gas phase; Given: 0.501459(12) eV; B |
Constants of diatomic molecules
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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: Klaus P. Huber and Gerhard H. Herzberg
Data collected through January, 1977
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Theoretical potential energy curves, coupling between molecular states Numrich and Truhlar, 1975. | ||||||||||||
| Fluctuating continuum in emission, 25000 - 33000 cm-1. | ||||||||||||
| ↳Hori, 1933 | ||||||||||||
| A 1Σ+ | 19052.8 | 228.2 Z | -5.75 1 | 1.269 | -0.0375 2 | 9.5E-5 | 3.68 | A 3 ↔ X R | 188680.1 Z | |||
| ↳Almy and Hause, 1932; Hori, 1933, 2; Almy and Beiler, 1942; Bartky, 1966 | ||||||||||||
| X 2Σ+ | 0 | 983.6 Z | 14.32 | 3.4123 | 0.0817 | 15.3E-5 | 2.2425 | |||||
Notes
| 1 | The ΔG(v+1/2) curve has a maximum at v ~11. |
| 2 | The Bv curve has a maximum at v ~7. |
| 3 | Radiative lifetime τ < 10 ns Cruse and Zare, 1974. |
| 4 | The ΔG(v+1/2) curve has a maximum at v ~16. |
| 5 | The Bv curve has a maximum at v ~11. |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, 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]
Andersson, Sandstrom, et al., 2000
Andersson, K.T.; Sandstrom, J.; Kiyan, I.Y.; Hanstorp, D.; Pegg, D.J.,
Measurement of the electron affinity of potassium - art. no. 022503,
Phys. Rev. A, 2000, 62, 2, 22503, https://doi.org/10.1103/PhysRevA.62.022503
. [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]
Numrich and Truhlar, 1975
Numrich, R.W.; Truhlar, D.G.,
Mixing of ionic and covalent configurations for NaH, KH, and MgH+. Potential energy curves and couplings between molecular states,
J. Phys. Chem., 1975, 79, 2745. [all data]
Hori, 1933
Hori,
(Reference not verified),
Mem. Ryojun Coll. Eng., 1933, 6, 115. [all data]
Almy and Hause, 1932
Almy, G.M.; Hause, C.D.,
The spectrum of potassium hydride,
Phys. Rev., 1932, 42, 242. [all data]
Hori, 1933, 2
Hori,
(Reference not verified),
Mem. Ryojun Coll. Eng., 1933, 6, 1. [all data]
Almy and Beiler, 1942
Almy, G.M.; Beiler, A.C.,
Potential energy curve of the excited state of KH,
Phys. Rev., 1942, 61, 476. [all data]
Bartky, 1966
Bartky, I.R.,
The A1Σ-X1Σ transition of 39KH and 39KD. Vibrational numbering and molecular constants,
J. Mol. Spectrosc., 1966, 20, 299. [all data]
Cruse and Zare, 1974
Cruse, J.A.; Zare, R.N.,
Fluorescence of the KH molecule,
J. Chem. Phys., 1974, 60, 1182. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions 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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