Chapter 20, Problem 20.77P

Interpretation Introduction

Interpretation:

The free energy $\Delta G^o$ of the given compound is to be calculated using the $K_{sp}$ value of $PbC{l}_2$.

Concept introduction:

Solubility product: The products of power of ion concentrations, which are dissolved in solvent is known as solubility product and it is it is also known as equilibrium between solute (ionic solids) and its saturated solutions.

Free energy change$\text{ΔG}$: change in the free energy takes place while reactants convert to product where both are in standard state. It depends on the equilibrium constant $\text{K}$

  $\begin{array}{l}\text{ΔG =}{\text{ΔG}}^{\text{o}}\text{+}\text{RT}\ln \left(\text{K}\right)\\ {\text{ΔG}}^{\text{o}}\text{=}{\text{ΔH}}^{\text{o}}-{\text{TΔS}}^{\text{o}}\end{array}$

  Where,

  $\text{T}$ is the temperature

  $\text{ΔG}$ is the free energy

  ${\text{ΔG}}^{\text{o}}$, ${\text{ΔH}}^{\text{o}}$ and ${\text{ΔS}}^{\text{o}}$ is standard free energy, enthalpy and entropy values.