Dissociation of an ionic compound in water
Enthalpy of Reaction
[1ΔHf(Ca+2 (aq)) + 2ΔHf(Br-1 (aq))] - [1ΔHf(CaBr2 (s))]
[1(-542.83) + 2(-121.55)] - [1(-683.25)] = -102.68 kJ
-102.68 kJ (exothermic)
Free Energy of Reaction (at 298.15 K)
From ΔGf° values:
[1ΔGf(Ca+2 (aq)) + 2ΔGf(Br-1 (aq))] - [1ΔGf(CaBr2 (s))]
[1(-553.54) + 2(-103.97)] - [1(-664.13)] = -97.35 kJ
-97.35 kJ (spontaneous)
From ΔG = ΔH - TΔS:
-97.31 kJ (spontaneous)
Equilibrium Constant, K (at 298.15 K)
This process is favorable at 25°C.
Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (1.137446854e+017) will be used to calculate the equilibrium concentration for all species.