potassium metaborate
- Formula: BKO2
- Molecular weight: 81.908
- CAS Registry Number: 13709-94-9
- Information on this page:
- Options:
Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, References, Notes
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 | -161.10 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1971 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 71.083 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1971 |
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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 2000. to 6000. |
|---|---|
| A | 19.44820 |
| B | 0.226259 |
| C | -0.044237 |
| D | 0.002984 |
| E | -1.338600 |
| F | -170.1760 |
| G | 90.05949 |
| H | -161.1000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1971 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References, Notes
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 | -234.40 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1971 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 21.14 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1971 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -237.80 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1971 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 19.11 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1971 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 1220. to 2000. |
|---|---|
| A | 35.00000 |
| B | -9.059401×10-8 |
| C | 4.971690×10-8 |
| D | -9.415091×10-9 |
| E | -9.420902×10-9 |
| F | -252.2689 |
| G | 48.37161 |
| H | -234.4000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1971 |
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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. to 1220. |
|---|---|
| A | 9.978380 |
| B | 28.58901 |
| C | -17.16220 |
| D | 3.609221 |
| E | -0.093386 |
| F | -242.2161 |
| G | 22.86940 |
| H | -237.8000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1971 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase 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 as indicated in comments:
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
B - John E. Bartmess
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 1.17 ± 0.22 | EIAE | Shevchenko, Iljin, et al., 1976 | From K2BO2F; value altered from reference due to conversion from electron convention to ion convention; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 8. ± 1. | EI | Farber and Srivastava, 1985 | LBLHLM |
| 8.62 ± 0.14 | EI | Shevchenko, Iljin, et al., 1976 | LLK |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| K+ | 9.47 ± 0.20 | BO2 | EI | Shevchenko, Iljin, et al., 1976 | LLK |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase 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.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Shevchenko, Iljin, et al., 1976
Shevchenko, V.E.; Iljin, M.K.; Nikitin, O.T.; Sidorov, L.N.,
Mass-spectrometric study of mixed dimers M2BO2F,
Int. J. Mass Spectrom. Ion Phys., 1976, 21, 279. [all data]
Farber and Srivastava, 1985
Farber, M.; Srivastava, R.D.,
Electron impact and thermodynamic studies of potassium metaborate,
J. Chem. Soc. Faraday Trans. 1, 1985, 81, 913. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity 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
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.