Chapter 7, Problem 7.25CP

Interpretation Introduction

Interpretation:

The given reactions are should be matched with given representations.

Concept introduction:

Water solubility of ionic compounds:

The ionic compound contains ${\text{Li}}^{\text{+,}}{\text{ Na}}^{\text{+}}{\text{, K}}^{\text{+}}{\text{, Rb}}^{\text{+}}{\text{, Cs}}^{\text{+}}{\text{ and NH}}_{\text{3}}$ ions, they are soluble in water.

Except ${\text{Ag+, Hg}}_{\text{2}}{}^{\text{2+}}{\text{, and Pb}}^{\text{2+}}$ halides, other halides ${\text{(Cl}}^{\text{-}}{\text{, Br}}^{\text{-}}{\text{, I}}^{\text{-}})$ are soluble in water.

Except ${\text{Sr}}^{\text{2+}}{\text{, Ba}}^{\text{2+}}{\text{, Hg}}_{\text{2}}{}^{\text{2+}}{\text{, and Pb}}^{\text{2+}}$ ions, other ${\text{NO}}_{\text{3}}{}^{-}{\text{, ClO}}_{\text{4}}{}^{\text{-}}{\text{, CH}}_{\text{3}}{\text{CO}}_{\text{2}}{}^{-}{\text{ and SO}}_{\text{4}}{}^{\text{2-}}$ ions containing compounds are soluble in water.

Except the compound contains alkali metal or ammonium cation, other carbonates, sulphides, phosphates, chromates and hydroxides, are insoluble in water.

Explanation of Solution

To match the given reactions with given representations.

Given reactions are,

$\begin{array}{l}{\text{(a) 2 Na}}^{\text{+}}{}_{\text{(aq)}}{\text{ + CO3}}^{\text{2-}}{}_{\text{(aq) }}\stackrel{}{\to }\\ {\text{(b) Ba}}^{\text{2+}}{\text{+ CrO}}_{\text{4}}{{}^{\text{2-}}}_{\text{(aq)}}\stackrel{}{\to }\\ {\text{(c) 2 Ag}}^{\text{+}}{}_{\text{(aq) }}{\text{+ SO}}_{\text{3}}{{}^{\text{2-}}}_{\text{(aq)}}\stackrel{}{\to }\end{array}$

Given representations are,

Figure 1

According to the solubility rule,

If reaction (a) take place to give a product of ${\text{Na}}_2{\text{CO}}_{\text{3}}$, and it is soluble in water so the reaction (a) is represent as representation (2) in above figure 1.

If reaction (b) take place to give a product of ${\text{BaCrO}}_{\text{4}}$, and it is insoluble in water so it is precipitated out from the solution and the balance barium ion are remaining in solution therefore  reaction (b) is represent as representation (1) in above figure 1.

If reaction (c) take place to give a product of ${\text{Ag}}_{\text{2}}{\text{SO}}_{\text{3}}$, and it is insoluble in water so the reaction (c) is represent as representation (3) in above figure 1.

Conclusion

The given reactions are matched with given representations.