## AlCl3 (s) + 3 NaOH (aq) → Al(OH)3 (s) + 3 NaCl (aq)

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## Reaction Type:

Double Displacement

## Stoichiometry

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 AlCl3          Mass: g NaOH           Mass: g or Solution Volume: mL of Concentration: mol/L Al(OH)3        Mass: g NaCl           Mass: g Heat Released: kJ

## Enthalpy of Reaction

[1ΔHf(Al(OH)3 (s)) + 3ΔHf(NaCl (aq))] - [1ΔHf(AlCl3 (s)) + 3ΔHf(NaOH (aq))]
[1(-1284.49) + 3(-407.25)] - [1(-705.63) + 3(-470.09)] = -390.34 kJ
-390.34 kJ     (exothermic)

## Entropy Change

[1ΔSf(Al(OH)3 (s)) + 3ΔSf(NaCl (aq))] - [1ΔSf(AlCl3 (s)) + 3ΔSf(NaOH (aq))]
[1(71.13) + 3(115.48)] - [1(109.29) + 3(48.25)] = 163.53 J/K
163.53 J/K     (increase in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Al(OH)3 (s)) + 3ΔGf(NaCl (aq))] - [1ΔGf(AlCl3 (s)) + 3ΔGf(NaOH (aq))]
[1(-1305.83) + 3(-393.15)] - [1(-630.07) + 3(-419.18)] = -597.67 kJ
-597.67 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-439.10 kJ     (spontaneous) ## Equilibrium Constant, K (at 298.15 K)

5.1651163753e+104
This process is favorable at 25°C.

## Reference(s):

Kotz, John C., Treichel, Paul, and Weaver, Gabriela. Chemistry & Chemical Reactivity 6th ed.; Thomson Brooks/Cole: Belmont, CA, 2006; p 166.