TlI (s) → Tl+1 (aq) + I-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Tl+1 (aq)) + 1ΔHf(I-1 (aq))] - [1ΔHf(TlI (s))]
[1(5.4) + 1(-55.19)] - [1(-123.85)] = 74.06 kJ
74.06 kJ     (endothermic)

Entropy Change

[1ΔSf(Tl+1 (aq)) + 1ΔSf(I-1 (aq))] - [1ΔSf(TlI (s))]
[1(125.5) + 1(111.29)] - [1(127.61)] = 109.18 J/K
109.18 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Tl+1 (aq)) + 1ΔGf(I-1 (aq))] - [1ΔGf(TlI (s))]
[1(-32.4) + 1(-51.59)] - [1(-125.39)] = 41.4 kJ
41.40 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

5.57994887317404E-08
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (5.57994887317404E-08) will be used to calculate the equilibrium concentration for all species.

TlI Tl+1 I-1
Initial M   0 0
Change -x +x +x
Equilibrium