Tl2CrO4 (s) → 2 Tl+1 (aq) + CrO4-2 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[2ΔHf(Tl+1 (aq)) + 1ΔHf(CrO4-2 (aq))] - [1ΔHf(Tl2CrO4 (s))]
[2(5.4) + 1(-881.15)] - [1(-944.75)] = 74.4 kJ
74.40 kJ     (endothermic)

Entropy Change

[2ΔSf(Tl+1 (aq)) + 1ΔSf(CrO4-2 (aq))] - [1ΔSf(Tl2CrO4 (s))]
[2(125.5) + 1(50.21)] - [1(282.42)] = 18.79 J/K
18.79 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[2ΔGf(Tl+1 (aq)) + 1ΔGf(CrO4-2 (aq))] - [1ΔGf(Tl2CrO4 (s))]
[2(-32.4) + 1(-727.85)] - [1(-861.49)] = 68.84 kJ
68.84 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

8.69125942049068E-13
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (8.69125942049068E-13) will be used to calculate the equilibrium concentration for all species.

Tl2CrO4 Tl+1 CrO4-2
Initial M   0 0
Change -x +2x +x
Equilibrium