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

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Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Pb+2 (aq)) + 2ΔHf(IO3-1 (aq))] - [1ΔHf(Pb(IO3)2 (s))]
[1(-1.7) + 2(-221.33)] - [1(-495.39)] = 51.03 kJ
51.03 kJ     (endothermic)

Entropy Change

[1ΔSf(Pb+2 (aq)) + 2ΔSf(IO3-1 (aq))] - [1ΔSf(Pb(IO3)2 (s))]
[1(10.5) + 2(118.41)] - [1(312.96)] = -65.64 J/K
-65.64 J/K     (decrease in entropy)