Chapter 8, Problem 3A

Interpretation Introduction

Interpretation :

When two solutions of ionic substances are mixed and a precipitate forms then the net charge of the precipitate must be explained.

Concept Introduction :

In a precipitation reaction two soluble substances react to produce an insoluble salt via double displacement reaction in which exchange of ions between the two participating species take place.

Answer to Problem 3A

Net charge of the precipitate will be zero as all compounds are neutral.

Explanation of Solution

Formation of AgCl(s) from NaCl (aq) and AgNO₃ (aq) is shown below.

  $\begin{array}{l}{\text{NaCl(aq)+AgNO}}_{\text{3}}\text{(aq)}\to \text{AgCl(s)}\downarrow {\text{+NaNO}}_3\text{(aq)}\text{.}\\ {\text{Ag}}^{\text{+}}{\text{(aq)+Cl}}^{\text{-}}\text{(aq)}\to \text{AgCl(s)}\text{.}\end{array}$

In this reaction Na+ (aq) and NO₃^-(aq) are cancelled from both the sides of the reaction.

Conclusion

Net charge of the precipitate is zero.