LiF (s) → Li+1 (aq) + F-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Li+1 (aq)) + 1ΔHf(F-1 (aq))] - [1ΔHf(LiF (s))]
[1(-278.5) + 1(-332.6)] - [1(-616.93)] = 5.82999999999993 kJ
5.83 kJ     (endothermic)

Entropy Change

[1ΔSf(Li+1 (aq)) + 1ΔSf(F-1 (aq))] - [1ΔSf(LiF (s))]
[1(13.4) + 1(-13.8)] - [1(35.65)] = -36.05 J/K
-36.05 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Li+1 (aq)) + 1ΔGf(F-1 (aq))] - [1ΔGf(LiF (s))]
[1(-293.3) + 1(-278.8)] - [1(-588.69)] = 16.59 kJ
16.59 kJ     (nonspontaneous)

From ΔG = ΔH - TΔS:
16.58 kJ     (nonspontaneous)

Equilibrium Constant, K (at 298.15 K)

0.0012399267309
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (0.0012399267309) will be used to calculate the equilibrium concentration for all species.

LiF Li+1 F-1
Initial M   0 0
Change -x +x +x
Equilibrium