Chapter 15, Problem 48E

Interpretation Introduction

Interpretation:

The given expression is to be checked whether it is correctly written or not. If not, write the given expression correctly.

Concept introduction:

For a reaction, equilibrium constant is given by the law of mass action. It is defined as the ratio of concentrations of products to that of reactants each raised to the power of the stoichiometric coefficients. Consider the chemical reaction as follows: $\text{aA}+\text{bB}\rightleftharpoons \text{cC}+\text{dD}$.

The equilibrium expression for the above reaction is written as:

$K_{\text{eq}}=\frac{{\left[\text{C}\right]}^c{\left[\text{D}\right]}^d}{{\left[\text{A}\right]}^a{\left[\text{B}\right]}^b}$

Here, the reactants are $\text{A}$ and $\text{B}$, the products are $\text{C and D}$, and the stoichiometric coefficients are $a,b,c,andd$.

The coefficient given in the chemical equation are represented as exponent in the expression of equilibrium constant.

In a chemical reaction the concentration of pure liquid or pure solid represented as $\left(l\right)$ and $\left(s\right)$ do not change. Hence, these concentration of reactant or product given as solids and liquids are not expressed in the expression of equilibrium constant.