Aluminum is one of the most versatile metals. It is produced by the Hall-Heroult

Question

Aluminum is one of the most versatile metals. It is produced by the Hall-Heroult process, in which molten cryolite, Na3AlF6, is used as a solvent for the aluminum ore. Cryolite undergoes very slight decomposition with heat to produce a tiny amount of F2, which escapes into the atmosphere above the solvent. Kc is 2 10-104 at 1300 K for the reaction. Na3AlF6(l) 3 Na(l) + Al(l) + 3 F2(g) What is the concentration of F2 over a bath of molten cryolite at this temperature? 8 1017 M 3 10-35 M 6 10-74 M 8 10-312 M 5 10102 M

Explanation / Answer

Na3AlF6(l) <=> 3 Na(l) + Al(l) + 3 F2(g)


Kc = [F2]^3 = 2 x 10^(-104)


[F2] = (2 x 10^(-104))^(1/3) = 3 x 10^(-35) M

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