TlBr (s) → Tl+1 (aq) + Br-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Tl+1 (aq)) + 1ΔHf(Br-1 (aq))] - [1ΔHf(TlBr (s))]
[1(5.4) + 1(-121.55)] - [1(-173.22)] = 57.07 kJ
57.07 kJ     (endothermic)

Entropy Change

[1ΔSf(Tl+1 (aq)) + 1ΔSf(Br-1 (aq))] - [1ΔSf(TlBr (s))]
[1(125.5) + 1(82.42)] - [1(120.5)] = 87.42 J/K
87.42 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Tl+1 (aq)) + 1ΔGf(Br-1 (aq))] - [1ΔGf(TlBr (s))]
[1(-32.4) + 1(-103.97)] - [1(-167.36)] = 30.99 kJ
30.99 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

3.7195019856e-006
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (3.7195019856e-006) will be used to calculate the equilibrium concentration for all species.

TlBr Tl+1 Br-1
Initial M   0 0
Change -x +x +x
Equilibrium