sodium fluoride

Formula: FNa
Molecular weight: 41.9881725
IUPAC Standard InChI: InChI=1S/FH.Na/h1H;/q;+1/p-1
IUPAC Standard InChIKey: PUZPDOWCWNUUKD-UHFFFAOYSA-M
CAS Registry Number: 7681-49-4
Chemical structure:
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Gas phase thermochemistry data

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Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-69.419	kcal/mol	Review	Chase, 1998	Data last reviewed in December, 1968
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	52.005	cal/mol*K	Review	Chase, 1998	Data last reviewed in December, 1968

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
C_p = 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)	3500. to 6000.
A	8.832601
B	0.256658
C	-0.025239
D	0.002151
E	-0.066425
F	-72.28740
G	62.24589
H	-69.42001
Reference	Chase, 1998
Comment	Data last reviewed in December, 1968

Reaction thermochemistry data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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Individual Reactions

4 + = 2 + + 3 sodium fluoride

By formula: 4Na + C₂ClF₃ = 2C + ClNa + 3FNa

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-376.7 ± 1.3	kcal/mol	Cm	Kolesov, Zenkov, et al., 1963	gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -368.8 ± 1.3 kcal/mol; ALS

2 + = + sodium fluoride +

By formula: 2HNaO + C₂H₃FO = C₂H₃NaO₂ + FNa + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-13.42 ± 0.02	kcal/mol	Cm	Pritchard and Skinner, 1950	liquid phase; Corrected for CODATA value of Δ_fH; HF(100); ALS
Δ_rH°	-42.4	kcal/mol	Cm	Carson and Skinner, 1949	liquid phase; ALS

Be₂F₅^- + sodium fluoride = (Be₂F₅^- • )

By formula: Be₂F₅^- + FNa = (Be₂F₅^- • FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	65.2 ± 2.5	kcal/mol	N/A	Nikitin, Sorokin, et al., 1980	gas phase; value altered from reference due to conversion from electron convention to ion convention; B

+ 4 = 4 + 8 sodium fluoride

By formula: C₄F₈ + 4Na = 4C + 8FNa

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-714.5 ± 2.2	kcal/mol	Ccb	Kolesov, Talakin, et al., 1968	gas phase; Correction of Kolesov, Talakin, et al., 1964; ALS

(F₂Sc⁺ • 2 sodium fluoride ) + = (F₂Sc⁺ • 3)

By formula: (F₂Sc⁺ • 2FNa) + FNa = (F₂Sc⁺ • 3FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	72.	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

(F₂Sc⁺ • 3 sodium fluoride ) + = (F₂Sc⁺ • 4)

By formula: (F₂Sc⁺ • 3FNa) + FNa = (F₂Sc⁺ • 4FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	67.	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

( • sodium fluoride ) + = ( • 2)

By formula: (Na⁺ • FNa) + FNa = (Na⁺ • 2FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	47.	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

(F₂Sc⁺ • sodium fluoride ) + = (F₂Sc⁺ • 2)

By formula: (F₂Sc⁺ • FNa) + FNa = (F₂Sc⁺ • 2FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	83.	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

+ sodium fluoride = ( • )

By formula: Na⁺ + FNa = (Na⁺ • FNa)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	62.7	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

4 + = + 4 sodium fluoride

By formula: 4Na + CF₄ = C + 4FNa

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-325.5 ± 2.2	kcal/mol	Ccb	Vorob'ev and Skuratov, 1960	gas phase; ALS

+ 4 = 4 sodium fluoride + 2

By formula: C₂F₄ + 4Na = 4FNa + 2C

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-385.0 ± 1.1	kcal/mol	Cm	Kolesov, Zenkov, et al., 1962	gas phase; ALS

8 + = 3 + 8 sodium fluoride

By formula: 8Na + C₃F₈ = 3C + 8FNa

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-660.0 ± 1.7	kcal/mol	Ccb	Kolesov, Talakin, et al., 1967	gas phase; ALS

References

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

Kolesov, Zenkov, et al., 1963
Kolesov, V.P.; Zenkov, I.D.; Skuratov, S.M., Standard enthalpy of formation of chlorotrifluoroethylene, Russ. J. Phys. Chem. (Engl. Transl.), 1963, 37, 115-116. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Pritchard and Skinner, 1950
Pritchard, H.O.; Skinner, H.A., The heat of hydrolysis of acetyl fluoride, J. Chem. Soc., 1950, 1099. [all data]

Carson and Skinner, 1949
Carson, A.S.; Skinner, H.A., 201. Carbon-halogen bond energies in the acetyl halides, J. Chem. Soc., 1949, 936-939. [all data]

Nikitin, Sorokin, et al., 1980
Nikitin, M.I.; Sorokin, I.D.; Skokan, E.V.; Sidorov, L.N., Negative Ions in the Saturated Vapors of the Potassium Fluoride - Hafnium Tetrafluoride and Potassium Fluoride - Beryllium Difluoride Systems, Russ. J. Phys. Chem., 1980, 54, page]. [all data]

Kolesov, Talakin, et al., 1968
Kolesov, V.P.; Talakin, O.G.; Skuratov, S.M., Enthalpy of formation of some specimens of amorphous carbon, Russ. J. Phys. Chem. (Engl. Transl.), 1968, 42, 1218-1220. [all data]

Kolesov, Talakin, et al., 1964
Kolesov, V.P.; Talakin, O.G.; Skuratov, S.M., Standard enthalpy of formation of perfluorocyclobutane, Russ. J. Phys. Chem. (Engl. Transl.), 1964, 38, 930-931. [all data]

Tsirlina, Gusarov, et al., 1986
Tsirlina, E.A.; Gusarov, A.V.; Gorokhov, L.N., High Temp., 1986, 14, 1064. [all data]

Vorob'ev and Skuratov, 1960
Vorob'ev, A.F.; Skuratov, S.M., Standard enthalpies of formation of CF₄, Zh. Neorg. Khim., 1960, 5, 1398-1401. [all data]

Kolesov, Zenkov, et al., 1962
Kolesov, V.P.; Zenkov, I.D.; Skuratov, S.M., The standard enthalpy of formation of tetrafluoroethylene, Russ. J. Phys. Chem. (Engl. Transl.), 1962, 36, 45-47. [all data]

Kolesov, Talakin, et al., 1967
Kolesov, V.P.; Talakin, O.G.; Skuratov, S.M., Standard enthalpy of formation of perfluoropropane and enthalpies of formation of normal perfluoroalkanes, Vestn. Mosk. Univ. Khim., 1967, 22, 38-42. [all data]

Notes

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Symbols used in this document:

S°_{gas,1 bar} Entropy of gas at standard conditions (1 bar)

Δ_fH°_gas Enthalpy of formation of gas at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions