YF3 (s) → Y+3 (aq) + 3 F-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Y+3 (aq)) + 3ΔHf(F-1 (aq))] - [1ΔHf(YF3 (s))]
[1(-723.41) + 3(-332.6)] - [1(-1718.79)] = -2.42000000000007 kJ
-2.42 kJ     (exothermic)

Entropy Change

[1ΔSf(Y+3 (aq)) + 3ΔSf(F-1 (aq))] - [1ΔSf(YF3 (s))]
[1(-251.04) + 3(-13.8)] - [1(100.42)] = -392.86 J/K
-392.86 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Y+3 (aq)) + 3ΔGf(F-1 (aq))] - [1ΔGf(YF3 (s))]
[1(-656.05) + 3(-278.8)] - [1(-1644.73)] = 152.28 kJ
152.28 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

2.0903247589e-027
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (2.0903247589e-027) will be used to calculate the equilibrium concentration for all species.

YF3 Y+3 F-1
Initial M   0 0
Change -x +x +3x
Equilibrium