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

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Reaction Type:

Double Displacement

Stoichiometry

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Al(OH)3        Mass: g
HCl            Mass: g  or Solution Volume: mL of Concentration: mol/L
AlCl3          Mass: g
H2O            Mass: g
Heat Released: kJ

Enthalpy of Reaction

[1ΔHf(AlCl3 (aq)) + 3ΔHf(H2O (ℓ))] - [1ΔHf(Al(OH)3 (s)) + 3ΔHf(HCl (aq))]
[1(-1032.82) + 3(-285.83)] - [1(-1284.49) + 3(-167.15)] = -104.37 kJ
-104.37 kJ     (exothermic)

Entropy Change

[1ΔSf(AlCl3 (aq)) + 3ΔSf(H2O (ℓ))] - [1ΔSf(Al(OH)3 (s)) + 3ΔSf(HCl (aq))]
[1(-152.31) + 3(69.91)] - [1(71.13) + 3(56.48)] = -183.15 J/K
-183.15 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(AlCl3 (aq)) + 3ΔGf(H2O (ℓ))] - [1ΔGf(Al(OH)3 (s)) + 3ΔGf(HCl (aq))]
[1(-879.09) + 3(-237.18)] - [1(-1305.83) + 3(-131.25)] = 108.95 kJ
108.95 kJ     (nonspontaneous)

From ΔG = ΔH - TΔS:
-49.76 kJ     (nonspontaneous)

Equilibrium Constant, K (at 298.15 K)

8.1606308037e-020
This process is not favorable at 25°C.

Reference(s):

Zumdahl, Steven and Zumdahl, Susan A. Chemistry 9th ed.; Brooks/Cole: Belmont, CA, 2014; p 131.
Kotz, John C., Treichel, Paul, and Weaver, Gabriela. Chemistry & Chemical Reactivity 6th ed.; Thomson Brooks/Cole: Belmont, CA, 2006; p 166.
Halka, Monica and Nordstrom, Brian. Metals & Metalloids; Infobase Publishing: New York, NY, 2011; p 15.

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