RaSO4 (s) → Ra+2 (aq) + SO4-2 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Ra+2 (aq)) + 1ΔHf(SO4-2 (aq))] - [1ΔHf(RaSO4 (s))]
[1(-527.6) + 1(-909.27)] - [1(-1471.09)] = 34.22 kJ
34.22 kJ     (endothermic)

Entropy Change

[1ΔSf(Ra+2 (aq)) + 1ΔSf(SO4-2 (aq))] - [1ΔSf(RaSO4 (s))]
[1(54) + 1(20.08)] - [1(138.07)] = -63.99 J/K
-63.99 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Ra+2 (aq)) + 1ΔGf(SO4-2 (aq))] - [1ΔGf(RaSO4 (s))]
[1(-561.5) + 1(-744.63)] - [1(-1365.66)] = 59.53 kJ
59.53 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

3.7171912215e-011
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (3.7171912215e-011) will be used to calculate the equilibrium concentration for all species.

RaSO4 Ra+2 SO4-2
Initial M   0 0
Change -x +x +x
Equilibrium