Chapter 8, Problem 8A

Interpretation Introduction

Interpretation :

On the basis of general solubility rules, which of the given ions will form a precipitate with ${\text{SO}}_4{}^{2-}$ must be explained along with the formula of the precipitate.

Concept Introduction :

When two soluble substances react to produce an insoluble salt via a double displacement reaction, then it is also called a precipitation reaction.

Answer to Problem 8A

  ${\text{Ba}}^{2+}$ , ${\text{Ag}}^{+}$ and ${\text{Ca}}^{2+}$ will form a precipitate with ${\text{SO}}_4{}^{2-}$ .

Formulas of the precipitates are ${\text{BaSO}}_{\text{4}}{\text{, Ag}}_{\text{2}}{\text{SO}}_{\text{4}}$ and ${\text{CaSO}}_{\text{4}}$ .

Explanation of Solution

Precipitation reactions are shown below. Precipitates are formed as solubility products of these salts that are overcome by their respective ionic products.

  $\begin{array}{l}{\text{Ba}}^{\text{2+}}{\text{(aq)+SO}}_{\text{4}}{}^{\text{2-}}\text{(aq)}\to {\text{BaSO}}_{\text{4}}\text{(s)}\\ {\text{Ca}}^{\text{2+}}{\text{(aq)+SO}}_{\text{4}}{}^{\text{2-}}\text{(aq)}\to {\text{CaSO}}_{\text{4}}\text{(s)}\\ {\text{2Ag}}^{\text{+}}{\text{(aq)+SO}}_{\text{4}}{}^{\text{2-}}\text{(aq)}\to {\text{Ag}}_{\text{2}}{\text{SO}}_{\text{4}}\text{(s)}\end{array}$

Conclusion

Thus, ${\text{Ba}}^{2+},{\text{ Ag}}^{+}$ and ${\text{Ca}}^{2+}$ will form a precipitate with ${\text{SO}}_4{}^{2-}$ .

Formulas of the precipitates are ${\text{BaSO}}_{\text{4}}{\text{, Ag}}_{\text{2}}{\text{SO}}_{\text{4}}$ and ${\text{CaSO}}_{\text{4}}$ .