Chapter 9, Problem 12STP

Interpretation Introduction

Interpretation:

The type of reaction given below needs to be explained, and this is to be explained how the reaction type is identified from the reactant.

${\text{AlCl}}_{\text{3}}\left(\text{aq}\right){\text{+Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(\text{aq}\right)\to$

Concept introduction:

Replacement reactions are mainly classified into two types single and double-replacement reaction. In single-replacement reaction, the atoms of one element displace the atoms of another element in a compound. Double-replacement reaction includes the transfer of ions between two compounds.

Answer to Problem 12STP

Two different reactants combined together and produce two different compounds one of the product formed is in solid state $\left({\text{Al}}_{\text{2}}{\text{O}}_3\left(\text{s}\right)\right)$. Hence, the reaction is double-replacement.

Explanation of Solution

Double-replacement reactions are those in which an exchange of ions between two compounds takes place. The given equation is as follows:

${\text{AlCl}}_{\text{3}}\left(\text{aq}\right){\text{+Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(\text{aq}\right)\to$

In aqueous state reactant molecule dissociates to ions. The complete reaction is as follows:

${\text{AlCl}}_{\text{3}}\left(\text{aq}\right){\text{+Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(\text{aq}\right)\to {\text{Al}}_{\text{2}}{\text{O}}_3\left(\text{s}\right){\text{+2FeCl}}_{\text{3}}\left(\text{aq}\right)$

In this reaction anion ${\text{Cl}}^{-}$ and ${\text{O}}^{\text{2}}{}^{-}$ change places and bonded with ${\text{Al}}^{\text{3+}}$ and ${\text{Fe}}^{\text{3+}}$ cations. The ion exchanges take place.

Conclusion

In double-replacement reaction two compounds are take part in the reaction and produce two different compounds one of the product is a solid, gas or water.