CALCIUM FLUORIDE - (7789-75-5)

Einführung

Name: calcium fluoride
* IUPAC
CAS-Nummer: 7789-75-5
Chemische Formel: CaF2
Molmasse: 78.0748064 g
Massenprozent: Ca 51.332 %; F 48.667 % 

Einstufung

Verwendung / Funktion

• "Almost half of the CaF2 mined is used in the steel industry, where it is added to the mixture of materials that is melted to make crude iron. The CaF2 acts to remove some impurities and improves the separation of molten metal from silicate impurities and other byproducts resulting from the reduction of iron ore to the metal." 1

• "in the manufacture of hydrofluoric acid" 2

• "Widely distributed mineral…in the production of HF." 3

• "used as a flux in steelmaking" 4

• "Fluoridation [in chemical water analysis]" 5

Physikalische Eigenschaften


Siedepunkt:*
2533.4°C 6 = 2806.55 K = 4592.12°F

* - 1 atm pressure

Löslichkeit

Ksp:3.45·10-11 7

Kleben

Kleben: ionic
Ionic Character: 90.30 %

Thermochemie

ΔHf° (s): -291.5 kcal/mol 8 = -1,219.64 kJ/mol
ΔHf° (ℓ): -283 kcal/mol 8 = -1,184.07 kJ/mol
ΔHf° (g): -187 kcal/mol 8 = -782.41 kJ/mol
S° (s): 16.46 cal/(mol•K) 9 = 68.87 J/(mol•K)
S° (ℓ): 22.13 cal/(mol•K) 9 = 92.59 J/(mol•K)
S° (g): 65.4 cal/(mol•K) 9 = 273.63 J/(mol•K)
ΔGf° (s): -279.0 kcal/mol 10 = -1,167.34 kJ/mol
ΔGf° (ℓ): -273 kcal/mol 10 = -1,142.23 kJ/mol
ΔGf° (g): -190 kcal/mol 10 = -794.96 kJ/mol

Die Reaktionen

Für mehr Informationen

Quellen

(1) - Kotz, Treichel, and Weaver. Chemistry & Chemical Reactivity, 6th ed.;Thomson Brooks/Cole: Belmont, CA, 2006; p 1029.
(2) - Kotz, Treichel, and Weaver. Chemistry & Chemical Reactivity, 6th ed.;Thomson Brooks/Cole: Belmont, CA, 2006; p 1029.
(3) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill: New York, 2006; p 601.
(4) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill: New York, 2006; p 601.
(5) - Hammer, Mark J. Water and Wastewater Technology, 2nd ed.; Prentice Hall: Englewood Cliffs, NJ, 1986; p 9.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2003; p 4-50.
(7) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 8:119-8:122.
(8) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(9) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(10) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(11) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 91.
(12) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change 4th ed.; McGraw-Hill: Boston, MA, 2006; p 127.
(13) - Zumdahl, Steven and Zumdahl, Susan A. Chemistry 9th ed.; Brooks/Cole: Belmont, CA, 2014; p 132.