K_a for benzoic acid (C₆H₅CO₂H) is 3.0 x 10^-5. What is the free energy change for the dissociation of this acid at 25°C?

Question

Quizplus · Accepted Answer

The free energy change (ΔG°) for the dissociation of an acid can be calculated using the equation ΔG° = -RTlnK. At 25°C (298 K), R = 8.314 J/mol·K. Substituting the given K_a value, ΔG° = - (8.314 J/mol·K)(298 K)ln(3.0 x 10^-5) = 25.8 kJ/mol.

Ka for Benzoic Acid (C6H5CO2H) Is 3

K_a for Benzoic Acid (C₆H₅CO₂H) Is 3