## HCl (aq) + 1 NaOH (aq) → H2O (ℓ) + NaCl (aq)

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## Stoichiometry

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 HCl            Mass: g or Solution Volume: mL of Concentration: mol/L NaOH           Mass: g or Solution Volume: mL of Concentration: mol/L H2O            Mass: g NaCl           Mass: g Heat Released: kJ

## Enthalpy of Reaction

[1ΔHf(H2O (ℓ)) + 1ΔHf(NaCl (aq))] - [1ΔHf(HCl (aq)) + 1ΔHf(NaOH (aq))]
[1(-285.83) + 1(-407.25)] - [1(-167.15) + 1(-470.09)] = -55.8399999999999 kJ
-55.84 kJ     (exothermic)

## Entropy Change

[1ΔSf(H2O (ℓ)) + 1ΔSf(NaCl (aq))] - [1ΔSf(HCl (aq)) + 1ΔSf(NaOH (aq))]
[1(69.91) + 1(115.48)] - [1(56.48) + 1(48.25)] = 80.66 J/K
80.66 J/K     (increase in entropy)

## Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(H2O (ℓ)) + 1ΔGf(NaCl (aq))] - [1ΔGf(HCl (aq)) + 1ΔGf(NaOH (aq))]
[1(-237.18) + 1(-393.15)] - [1(-131.25) + 1(-419.18)] = -79.9 kJ
-79.90 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-79.89 kJ     (spontaneous)

## Equilibrium Constant, K (at 298.15 K)

9.969038464e+013
This process is favorable at 25°C.

## Reference(s):

Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; pp 76, 86, 138.