We’re asked to calculate ΔG° (kJ/mol) for the (a) base ionization of aniline and (b) base ionization of ammonia.
Recall that ΔG˚rxn and K are related to each other:
ΔG˚rxn = standard Gibbs free energy of the reaction
R = 8 .314 J/mol • K (gas rate constant)
K = equilibrium constant
T = temperature in K (Kelvin)
Also, recall that Kb is the base dissociation constant and it is an equilibrium expression.
To solve for ΔG˚ of aniline and ammonia, we need to do these steps:
Step 1: Determine base equilibrium constant, Kb for each base .
Step 2: Calculate ΔG˚rxn
Aniline, C6H5NH2 is a weak base related to ammonia. It reacts with water as shown in the following equation.
C6H5NH2 (aq) + H2O (l) → C6H5NH4+(aq) + OH- (aq) Kb (aq) = 4.27 x 10 -10
(a) Calculate ΔG° for the base ionization of aniline. (kJ/mol)
(b) Calculate ΔG° for the base ionization of ammonia.(kJ/mol)
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