Q59 P - Chemistry: Molecular Nature Of Matter And Change

Question

Give systematic names for the following formulas:

1. $\mathit{K}\mathbf{\left[}\mathbf{A}\mathbf{g}{\mathbf{\left(}\mathbf{C}\mathbf{N}\mathbf{\right)}}_{\mathbf{2}}\mathbf{\right]}$
2. $\mathit{N}{\mathit{a}}_{\mathbf{2}}\mathbf{\left[}\mathbf{C}\mathbf{d}\mathbf{C}{\mathbf{l}}_{\mathbf{4}}\mathbf{\right]}$
   
3. $\mathbf{\left[}\mathbf{C}\mathbf{o}{\mathbf{\left(}\mathbf{N}{\mathbf{H}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{4}}\mathbf{\left(}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\right)}\mathbf{B}\mathbf{r}\mathbf{\right]}\mathit{B}{\mathit{r}}_{\mathbf{2}}$
   

Step-by-Step Solution

Answer

a) $K\left[\mathrm{Ag}{\left(\mathrm{CN}\right)}_2\right]$ - potassium di cyano argentate(l)

b) $N{a}_2\left[{\mathrm{CdCl}}_4\right]$ - sodium tetra chlorocadmate (II)

c) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{Br}\right]B{r}_2$ - tetra ammine aqua bromo cobalt (III)

Step 1: Definition of Coordination Compound

A coordination complex is made up of a core atom or ion, known as the coordination center, which is typically metallic, and an array of attached molecules or ions that are known as ligands or complexing agents.

Step 2: Solve the given statements

We must state certain principles for identifying coordination compounds in order to solve issues like these:

- cation is named before the anion

- In the complexion, we name ligands before metal ions, in alphabetical order

- A numerical prefix is the number of ligands of a particular type

- The oxidation state of the metal ion is written by roman numerals in parentheses if the metal ion has more than one oxidation state

- If the complex ion is an anion, we add -ate instead of the ending of the metal name

- Neutral ligands most often have molecule names, but anionic ligands lose the -ide and add -o after the root name

a) $K\left[\mathrm{Ag}{\left(\mathrm{CN}\right)}_2\right]$ - potassium dicyanoargentate(l)

b) $N{a}_2\left[{\mathrm{CdCl}}_4\right]$ - sodium tetrachlorocadmate (II)

c) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{Br}\right]B{r}_2$ - tetraammineaquabromocobalt (III)