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:

$\overline{){\mathbf{\Delta G}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{-}}{\mathbf{RTlnK}}}$

where:

**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** K**** _{b }**is the

To solve for ** ΔG˚ of aniline and ammonia, **we need to do these steps:

**Step 1****: **Determine base equilibrium constant, **K**_{b}*for each base *_{ }*.*

*Step 2: **Calculate ΔG˚_{rxn}*

Aniline, C_{6}H_{5}NH_{2} is a weak base related to ammonia. It reacts with water as shown in the following equation.

C_{6}H_{5}NH_{2 }(aq) + H_{2}O (l) → C_{6}H_{5}NH_{4}^{+}(aq) + OH^{- }(aq) K_{b }(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)

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Gibbs Free Energy concept. You can view video lessons to learn Gibbs Free Energy. Or if you need more Gibbs Free Energy practice, you can also practice Gibbs Free Energy practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Prokipcak's class at University of Guelph.