Chapter 15, Problem 15.125SP

Interpretation Introduction

(a)

Interpretation:

The change in concentration of ${\text{FeCl}}^{2+}$ due to the addition of $\text{Fe}{\left({\text{NO}}_{\text{3}}\right)}_{\text{3}}$ needs to be determined using Le Chatelier’s principle.

Concept introduction:

According to Le Chatelier’s principle, if equilibrium is disturbed by changing the number of moles, pressure and temperature, the equilibrium will shift to remove the disturbance. For example, if number of moles or pressure of reactant is increased, the reaction will shift in forward direction to decrease the number of moles or pressure of the reactant.

If temperature is increased, the reaction moves to forward direction for an endothermic reaction and it moves to backward direction for exothermic reaction.

Interpretation Introduction

(b)

Interpretation:

The change in concentration of ${\text{FeCl}}^{2+}$ due to the precipitation ${\text{Cl}}^{\text{-}}$ as $\text{AgCl}$ by addition of ${\text{AgNO}}_{\text{3}}$ needs to be explained using the Le Chatelier’s principle.

Concept introduction:

According to Le Chatelier’s principle, if equilibrium is disturbed by changing the number of moles, pressure and temperature, the equilibrium will shift to remove the disturbance. For example, if number of moles or pressure of reactant is increased, the reaction will shift in forward direction to decrease the number of moles or pressure of the reactant.

If temperature is increased, the reaction moves to forward direction for an endothermic reaction and it moves to backward direction for exothermic reaction.

Interpretation Introduction

(c)

Interpretation:

The change in the concentration of ${\text{FeCl}}^{2+}$ due to increasing temperature needs to be explained using the Le Chatelier’s principle.

Concept introduction:

According to Le Chatelier’s principle, if equilibrium is disturbed by changing the number of moles, pressure and temperature, the equilibrium will shift to remove the disturbance. For example, if number of moles or pressure of reactant is increased, the reaction will shift in forward direction to decrease the number of moles or pressure of the reactant.

If temperature is increased, the reaction moves to forward direction for an endothermic reaction and it moves to backward direction for exothermic reaction.

Interpretation Introduction

(d)

Interpretation:

The change in concentration of ${\text{FeCl}}^{2+}$ due to the addition of catalyst needs to be explained using the Le Chatelier’s principle.

Concept introduction:

According to Le Chatelier’s principle, if equilibrium is disturbed by changing the number of moles, pressure and temperature, the equilibrium will shift to remove the disturbance. For example, if number of moles or pressure of reactant is increased, the reaction will shift in forward direction to decrease the number of moles or pressure of the reactant.

If temperature is increased, the reaction moves to forward direction for an endothermic reaction and it moves to backward direction for exothermic reaction.