Chapter 7.4, Problem 7.8PP

(a)

Interpretation Introduction

Interpretation:

The equilibrium constant expression of ${\text{AgCl}}_{\text{(s)}}\underset{}{\rightleftharpoons }{\text{ Ag}}_{\text{(aq)}}^{\text{+}}{\text{ + Cl}}_{\text{(aq)}}^{\text{-}}$ reaction has to be written.

Concept Introduction:

Equilibrium constant$\left(\text{K}\right)$:

It is the ratio of the concentrations of the products to concentrations of the reactants.  Each concentration term is raise to the power, which is same as the coefficients in the chemical reaction.

Consider the reaction,

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

    $\text{k}\text{=}\frac{{\text{[C]}}^{\text{c}}{\text{[D]}}^{\text{d}}}{{\text{[A]}}^{\text{a}}{\text{[B]}}^{\text{b}}}$

Where,

    $\text{K}$ is the equilibrium constant.

    $\text{A,B,}\text{and}\text{C,D}$ are concentration of reactants and products.

    $\text{a, b and c, d}$ are coefficients of reactants and products.

(b)

Interpretation Introduction

Interpretation:

The equilibrium constant expression of ${\text{PCl}}_{\text{5(s)}}\underset{}{\rightleftharpoons }{\text{PCl}}_{\text{3(g)}}{\text{ + Cl}}_{\text{2(g)}}$ reaction has to be written.

Concept Introduction:

Refer to part (a).