KIO3 (s) → K+1 (aq) + IO3-1 (aq)

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(K+1 (aq)) + 1ΔHf(IO3-1 (aq))] - [1ΔHf(KIO3 (s))]
[1(-252.4) + 1(-221.33)] - [1(-508.36)] = 34.63 kJ
34.63 kJ     (endothermic)

Entropy Change

[1ΔSf(K+1 (aq)) + 1ΔSf(IO3-1 (aq))] - [1ΔSf(KIO3 (s))]
[1(102.5) + 1(118.41)] - [1(151.46)] = 69.45 J/K
69.45 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(K+1 (aq)) + 1ΔGf(IO3-1 (aq))] - [1ΔGf(KIO3 (s))]
[1(-283.3) + 1(-128.03)] - [1(-425.51)] = 14.1799999999999 kJ
14.18 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

0.0032781834179
This process is not favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (0.0032781834179) will be used to calculate the equilibrium concentration for all species.

KIO3 K+1 IO3-1
Initial M   0 0
Change -x +x +x
Equilibrium