Answer:
88 kJ/mol
Explanation:
Let's consider the solution of Co(OH)₂.
Co(OH)₂(s) ⇄ Co²⁺(aq) + 2 OH⁻(aq)
The solubility product (Ksp) is 3.3 × 10⁻¹⁶. We can find the Gibbs free energy change (ΔG°) using the following expression.
ΔG° = - R × T × lnKsp
where,
R: ideal gas constant
T: absolute temperature (25°C + 273.15 = 298 K)
ΔG° = - R × T × lnKsp
ΔG° = - (8.314 × 10⁻³ kJ/mol.K) × 298 K × ln 3.3 × 10⁻¹⁶
ΔG° = 88 kJ/mol
