2 HCl (aq) + 1 Ca(OH)2 (aq) → CaCl2 (aq) + H2O (ℓ)

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Stoichiometry

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HCl            Mass: g  or Solution Volume: mL of Concentration: mol/L
Ca(OH)2        Mass: g  or Solution Volume: mL of Concentration: mol/L
CaCl2          Mass: g  or Solution Volume: mL of Concentration: mol/L
H2O            Mass: g

Enthalpy of Reaction

[1ΔHf(CaCl2 (aq)) + 1ΔHf(H2O (ℓ))] - [2ΔHf(HCl (aq)) + 1ΔHf(Ca(OH)2 (aq))]
[1(-877.13) + 1(-285.83)] - [2(-167.15) + 1(-1002.81)] = 174.15 kJ
174.15 kJ     (endothermic)

Entropy Change

[1ΔSf(CaCl2 (aq)) + 1ΔSf(H2O (ℓ))] - [2ΔSf(HCl (aq)) + 1ΔSf(Ca(OH)2 (aq))]
[1(59.82) + 1(69.91)] - [2(56.48) + 1(-74.64)] = 91.41 J/K
91.41 J/K     (increase in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(CaCl2 (aq)) + 1ΔGf(H2O (ℓ))] - [2ΔGf(HCl (aq)) + 1ΔGf(Ca(OH)2 (aq))]
[1(-816.04) + 1(-237.18)] - [2(-131.25) + 1(-868.1)] = 77.3799999999999 kJ
77.38 kJ     (nonspontaneous)

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

Equilibrium Constant, K (at 298.15 K)

2.77240193459467E-14
This process is not favorable at 25°C.

Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 90.

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