Chapter 19, Problem 80AE

(a)

Interpretation Introduction

Interpretation: Whether the given reaction is an oxidation-reduction process or not needs to be determined.

  ${\text{[Cu(NH}}_{\text{3}}{\text{)}}_{\text{4}}{\text{]Cl}}_{\text{2(aq)}}{\text{+4NH}}_{\text{3(aq)}}{\text{+Cu}}_{\text{(s)}}\stackrel{}{\to }2{\text{[Cu(NH}}_{\text{3}}{\text{)}}_{\text{4}}{\text{]Cl}}_{\text{(aq)}}$

Concept Introduction: A coordination complex is composed of two main parts; metal atom/ ion and ligand. Ligands are the atom/ group of atom/ ion that can donate its extra pair of electrons to the electron deficient metal cation. It leads to the formation of coordinate bond between metal ion and ligand.

(b)

Interpretation Introduction

Interpretation: The mass of ${\text{[Cu(NH}}_{\text{3}}{\text{)}}_{\text{4}}\text{]Cl}$ and ${\text{NH}}_{\text{3(aq)}}$ needed to make 10,000 printed circuit boards needs to be determined, if each board is 8.0 cm x 16.0 cm in area and an average of 80% of the copper is removed from each board. The density of copper is 8.96 g/cm³.

  ${\text{[Cu(NH}}_{\text{3}}{\text{)}}_{\text{4}}{\text{]Cl}}_{\text{2(aq)}}{\text{+4 NH}}_{\text{3(aq)}}{\text{+Cu}}_{\text{(s)}}\stackrel{}{\to }2{\text{[Cu(NH}}_{\text{3}}{\text{)}}_{\text{4}}{\text{]Cl}}_{\text{(aq)}}$

Concept Introduction: A coordination complex is composed of two main parts; metal atom/ ion and ligand. Ligands are the atom/ group of atom/ ion that can donate its extra pair of electrons to the electron deficient metal cation. It leads to the formation of coordinate bond between metal ion and ligand.