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

Back to reactions list

Reaction Type:

Double Displacement

Stoichiometry

Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. All gases are assumed to be at STP.

 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.