Chapter 12, Problem 18QRT

(a)

Interpretation Introduction

Interpretation:

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

Concept Introduction:

Equilibrium constant: At equilibrium the ratio of products to reactants (each raised to the power corresponding to its stoichiometric coefficient) has a constant value, K

For a general reaction,

  $\text{aA+bB}\rightleftarrows \text{cC+dD}$

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

The concentration of solids and pure liquids do not change, so their concentration terms are not included in the equilibrium constant expression.

(b)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{Co(H}}_{\text{2}}{\text{O)}}_6{{}^{2+}}_{\text{(aq)}}{\text{ + 4Cl}}^{-}{}_{\text{(aq)}}\rightleftharpoons {\text{ CoCl}}_{\text{4}}{{}^{2-}}_{\text{(aq)}}{\text{ + 6H}}_{\text{2}}{\text{O}}_{\text{(l)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.

(c)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{CH}}_{\text{3}}{\text{COOH}}_{\text{(aq)}}\rightleftharpoons {\text{ CH}}_{\text{3}}{\text{COO}}^{-}{}_{\text{(aq)}}{\text{ + H}}^{+}{}_{\text{(aq)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.

(d)

Interpretation Introduction

Interpretation:

The equilibrium constant expression for the reaction ${\text{2F}}_{\text{2(g)}}{\text{ + H}}_{\text{2}}{\text{O}}_{\text{(g)}}\rightleftharpoons {\text{ OF}}_{\text{2(g)}}{\text{ + 2HF}}_{\text{(g)}}$ has to be written.

Concept Introduction:

Refer part (a) for concept.