Chapter 13, Problem 13.72SP

Interpretation Introduction

Interpretation:

The direction in which the given reaction moves has to be predicted. Also calculate the reaction quotient.

Concept Introduction:

Reaction quotient (Q) is the ratio of product of concentration of products to that of product of concentration of reactants, raised to the power of coefficients.

Consider a reaction

$\text{aA + bB}\stackrel{}{\rightleftharpoons }\text{cC + dD}$

$\text{Reaction}\text{quotient}{\text{Q}}_{\text{p}}\text{=}\frac{{\text{P}}_{\text{C}}{}^{\text{c}}{\text{P}}_{\text{D}}{}^{\text{d}}}{{\text{P}}_{\text{A}}{}^{\text{a}}{\text{P}}_{\text{B}}{}^{\text{b}}}$

Where,

a, b, c and d are coefficients of each species.

If ${\text{Q}}_{\text{p}}\text{<}{\text{K}}_{\text{p}}$, the reaction proceeds to forward direction(reactants $\stackrel{}{\to }$ products) to attain equilibrium.

If ${\text{Q}}_{\text{p}}>{\text{K}}_{\text{p}}$, the reaction proceeds to forward direction(products $\stackrel{}{\to }$ reactants) to attain equilibrium.

If ${\text{Q}}_{\text{p}}={\text{K}}_{\text{p}}$, the reaction is at equilibrium