Chapter 18, Problem 120A

(a)

Interpretation Introduction

Interpretation: The complete ionic equation for the reaction of aqueous silver nitrate with aqueous potassium iodide to form silver iodide precipitate is to be stated.

Concept Introduction: The chemical equation in which the reacting species are represented as dissociated ions is termed an ionic equation.

Answer to Problem 120A

Explanation of Solution

The molecular equation for the reaction of aqueous silver nitrate with aqueous potassium iodide to form silver iodide precipitate is given as;

  ${\text{AgNO}}_{\text{3}}\left(\text{aq}\right)+\text{KI}\left(\text{aq}\right)\to \text{AgI}\left(\text{s}\right)+{\text{KNO}}_{\text{3}}\left(\text{aq}\right)$

Now, the complete ionic equation for the above reaction is given;

  ${\text{Ag}}^{+}\left(\text{aq}\right)+{\text{NO}}_3^{-}\left(\text{aq}\right)+{\text{K}}^{+}\left(\text{aq}\right)+\text{I}\left(\text{aq}\right)\to \text{AgI}\left(\text{s}\right)+{\text{K}}^{+}\left(\text{aq}\right)+{\text{NO}}_3^{-}\left(\text{aq}\right)$

(b)

Interpretation Introduction

Interpretation: Spectator ions are to be defined.

Concept Introduction: The chemical equation in which the reacting species are represented as dissociated ions is termed an ionic equation.

Answer to Problem 120A

The ions in an ionic equation that are present on the both reactant as well as product side are termed spectator ions.

Explanation of Solution

The ions in an ionic equation which are present on the both reactant as well as product side are termed as spectator ions. Spectator ions get cancelled while writing a net ionic equation.