Chapter 11, Problem 60A

(a)

Interpretation Introduction

Interpretation:

The type of reaction taking place needs to be identified if chlorine gas is passed through sodium iodide solution.

Concept Introduction:

A chemical reaction is a reaction in which reactants react with each other to form products. There are different kinds of chemical reactions such as single replacement, double replacement, combustion reaction, combination reaction, and decomposition reaction.

Answer to Problem 60A

The type of reaction is single-replacement.

Explanation of Solution

The reaction given is:

Pale yellow chlorine gas is bubbled through a clear solution of sodium iodide the solution turns brown.

The chemical equation can be written as:

  ${\text{Cl}}_{\text{2}}\left(g\right)\text{+ 2NaI}\left(aq\right)\to 2\text{NaCl }\left(s\right){\text{+ I}}_{\text{2}}\left(g\right)$

This is the single replacement reaction as one element replaces another element in a compound.

(b)

Interpretation Introduction

Interpretation:

The net ionic equation for the reaction of chlorine gas and sodium iodide needs to be written.

Concept Introduction:

A net ionic equation is a reaction in a solution in which only directly participating ions are shown. The ions which do not participate in the reaction and are present on both sides of the reaction arrow in the ionic equation are known as spectator ions.

Answer to Problem 60A

The net ionic equation is: ${\text{Cl}}_{\text{2}}\text{(}g{\text{)+ 2I}}^{-}(aq)\to 2{\text{Cl}}^{-}\text{(}aq{\text{) + I}}_{\text{2}}(g)$

Explanation of Solution

The chemical reaction that is taking place is:

  ${\text{Cl}}_{\text{2}}\text{(}g\text{)+ 2NaI}(aq)\to 2\text{NaCl }(aq){\text{+ I}}_{\text{2}}(g)$

First write the ionic equation, in which aqueous solutions are represented as ions.

  ${\text{Cl}}_{\text{2}}\text{(}g{\text{)+ 2Na}}^{+}(aq){\text{+2I}}^{-}(aq)\to 2{\text{Na}}^{+}(aq){\text{+2Cl}}^{-}(aq){\text{+ I}}_{\text{2}}(g)$

So, the net ionic equation is:

  ${\text{Cl}}_{\text{2}}\text{(}g{\text{)+2I}}^{-}(aq)\to {\text{2Cl}}^{-}(aq){\text{+ I}}_{\text{2}}(g)$