Chapter 9, Problem 97A

Interpretation Introduction

Interpretation:

The given chemical equation needs to be completed.

${\text{CuCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)\to$

Concept introduction:

Chemical equation is the symbolic description of a chemical reaction that products and reactants are indicating in terms of their chemical formula.

Answer to Problem 97A

Complete given chemical equation is as follows:

${\text{CuCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)\to {\text{CuSO}}_{\text{4}}\left(aq\right)+2\text{NaCl}\left(aq\right)$

Explanation of Solution

In the given reaction, Cu can displace Na from its solution to form ${\text{CuSO}}_{\text{4}}\left(aq\right)$ and $\text{NaCl}\left(aq\right)$ (dissolved in water).

Thus, the reaction is represented as follows:

${\text{CuCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)\to {\text{CuSO}}_{\text{4}}\left(aq\right)+\text{NaCl}\left(aq\right)$

Now balance the above equation is as follows:

${\text{CuCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)\to {\text{CuSO}}_{\text{4}}\left(aq\right)+2\text{NaCl}\left(aq\right)$

Conclusion

There are two sodium atoms and two chlorine atoms in the reactant side. Thus give coefficient 2 to NaCl to balance the equation. Therefore complete given chemical equation is as follows:

${\text{CuCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)\to {\text{CuSO}}_{\text{4}}\left(aq\right)+2\text{NaCl}\left(aq\right)$