NaBr (s) → Na+1 (aq) + Br-1 (aq)

Back to reactions list

 

Reaction Type:

Dissociation of an ionic compound in water

Enthalpy of Reaction

[1ΔHf(Na+1 (aq)) + 1ΔHf(Br-1 (aq))] - [1ΔHf(NaBr (s))]
[1(-240.1) + 1(-121.55)] - [1(-361.41)] = -0.239999999999952 kJ
-0.24 kJ     (exothermic)

Entropy Change

[1ΔSf(Na+1 (aq)) + 1ΔSf(Br-1 (aq))] - [1ΔSf(NaBr (s))]
[1(59) + 1(82.42)] - [1(86.82)] = 54.6 J/K
54.60 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Na+1 (aq)) + 1ΔGf(Br-1 (aq))] - [1ΔGf(NaBr (s))]
[1(-261.9) + 1(-103.97)] - [1(-349.28)] = -16.59 kJ
-16.59 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-16.52 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

806.499267320449
This process is favorable at 25°C.

Enter an initial concentration for the ionic compound. Upon hitting submit, Ksp (806.499267320449) will be used to calculate the equilibrium concentration for all species.

NaBr Na+1 Br-1
Initial M   0 0
Change -x +x +x
Equilibrium