## AlCl3 (s) + 3 H2O (ℓ) → Al(OH)3 (s) + 3 HCl (aq)

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## Reaction Type:

Double Displacement

## Stoichiometry

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 AlCl3          Mass: g H2O            Mass: g Al(OH)3        Mass: g HCl            Mass: g Heat Released: kJ

## Enthalpy of Reaction

[1ΔHf(Al(OH)3 (s)) + 3ΔHf(HCl (aq))] - [1ΔHf(AlCl3 (s)) + 3ΔHf(H2O (ℓ))]
[1(-1284.49) + 3(-167.15)] - [1(-705.63) + 3(-285.83)] = -222.82 kJ
-222.82 kJ     (exothermic)

## Entropy Change

[1ΔSf(Al(OH)3 (s)) + 3ΔSf(HCl (aq))] - [1ΔSf(AlCl3 (s)) + 3ΔSf(H2O (ℓ))]
[1(71.13) + 3(56.48)] - [1(109.29) + 3(69.91)] = -78.45 J/K
-78.45 J/K     (decrease in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Al(OH)3 (s)) + 3ΔGf(HCl (aq))] - [1ΔGf(AlCl3 (s)) + 3ΔGf(H2O (ℓ))]
[1(-1305.83) + 3(-131.25)] - [1(-630.07) + 3(-237.18)] = -357.97 kJ
-357.97 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-199.43 kJ     (spontaneous) ## Equilibrium Constant, K (at 298.15 K)

5.2133909784e+062
This process is favorable at 25°C.

## Reference(s):

Kotz, John C. and Treichel, Paul. Chemistry & Chemical Reactivity 4th ed.; Thomson Brooks/Cole: Belmont, CA, 1999; p 173.