Ra(IO3)2 (s) → Ra+2 (aq) + 2 IO3-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Ra+2 (aq)) + 2ΔHf(IO3-1 (aq))] - [1ΔHf(Ra(IO3)2 (s))]
[1(-527.6) + 2(-221.33)] - [1(-1026.75)] = 56.49 kJ
56.49 kJ     (endothermic)

Entropy Change

[1ΔSf(Ra+2 (aq)) + 2ΔSf(IO3-1 (aq))] - [1ΔSf(Ra(IO3)2 (s))]
[1(54) + 2(118.41)] - [1(271.96)] = 18.86 J/K
18.86 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Ra+2 (aq)) + 2ΔGf(IO3-1 (aq))] - [1ΔGf(Ra(IO3)2 (s))]
[1(-561.5) + 2(-128.03)] - [1(-868.6)] = 51.0400000000001 kJ
51.04 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

1.1420399973e-009
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (1.1420399973e-009) will be used to calculate the equilibrium concentration for all species.

Ra(IO3)2 Ra+2 IO3-1
Initial M   0 0
Change -x +x +2x
Equilibrium