Chapter 14, Problem 14.84QP

Interpretation Introduction

Interpretation:

The equilibrium constant ${\text{K}}_c$ has to be found for the given reaction.

Concept introduction:

Equilibrium constant $\left({\text{K}}_{\text{c}}\right)$: A system is said to be in equilibrium when all the measurable properties of the system remains unchanged with the time.  Equilibrium constant is the ratio of the concentrations of the products to concentrations of the reactants at a given temperature.  Each concentration term is raised to a power, which is same as the coefficients in the chemical reaction.

Consider the reaction where the reactant A is giving product B.

$\text{A}\rightleftharpoons \text{B}$

The equilibrium constant ,

${\text{K}}_{\text{c}}=\frac{\left[\text{A}\right]}{\left[\text{B}\right]}$

While writing equilibrium constant for heterogeneous equilibrium, the concentrations of pure liquids and solids are not included.  Because, at a given temperature the concentrations of pure solids and liquids remains constant as they are incompressible.