RbClO4 (s) → Rb+1 (aq) + ClO4-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Rb+1 (aq)) + 1ΔHf(ClO4-1 (aq))] - [1ΔHf(RbClO4 (s))]
[1(-251.2) + 1(-129.33)] - [1(-434.59)] = 54.06 kJ
54.06 kJ     (endothermic)

Entropy Change

[1ΔSf(Rb+1 (aq)) + 1ΔSf(ClO4-1 (aq))] - [1ΔSf(RbClO4 (s))]
[1(121.5) + 1(182)] - [1(160.67)] = 142.83 J/K
142.83 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Rb+1 (aq)) + 1ΔGf(ClO4-1 (aq))] - [1ΔGf(RbClO4 (s))]
[1(-284) + 1(-8.62)] - [1(-306.23)] = 13.61 kJ
13.61 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

0.0041257079815
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (0.0041257079815) will be used to calculate the equilibrium concentration for all species.

RbClO4 Rb+1 ClO4-1
Initial M   0 0
Change -x +x +x
Equilibrium