Q56 P - Chemistry: Molecular Nature Of Matter And Change

Question

Give systematic names for the following formulas:

(a) $\mathbf{\left[}\mathbf{C}\mathbf{o}{\left(N{H}_3\right)}_{\mathbf{4}}{\left(N{O}_2\right)}_{\mathbf{2}}\mathbf{\right]}\mathit{C}\mathit{l}$

(b) $\mathbf{\left[}\mathbf{C}\mathbf{r}{\left(N{H}_3\right)}_{\mathbf{6}}\mathbf{\right]}\mathbf{\left[}\mathbf{C}\mathbf{r}{\left(CN\right)}_{\mathbf{6}}\mathbf{\right]}$

(c) ${\mathit{K}}_{\mathbf{2}}\mathbf{\left[}\mathbf{C}\mathbf{u}\mathbf{C}{\mathbf{l}}_{\mathbf{4}}\mathbf{\right]}$

Step-by-Step Solution

Answer

a) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\left({\mathrm{NO}}_2\right)}_2\right]Cl$ - tetra amine di nitro cobalt(III)chloride

b) $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]\left[\mathrm{Cr}{\left(\mathrm{CN}\right)}_6\right]$ - hexa amine chromium(III)hexa cyano chromate(III)

c) $K_2\left[{\mathrm{CuCl}}_4\right]$ - potassium tetra chloro cuprate(III)

Step 1: Definition of Coordination Compound

A coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents.

Step 2: Solve the given statements

In order to solve problems like this, there are some rules for naming coordination compounds:

- cation is named before anion

- In the complex ion, we name ligands before metal ion, in alphabetical order

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

- The oxidation state of 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 metal name

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

So, these are solution of given compounds 

a) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\left({\mathrm{NO}}_2\right)}_2\right]Cl$ - tetra amine di nitro cobalt(III)chloride

b) $\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]\left[\mathrm{Cr}{\left(\mathrm{CN}\right)}_6\right]$ - hexa amine chromium (III)hexa cyano chromate(III)

c) $K_2\left[{\mathrm{CuCl}}_4\right]$ - potassium tetra chloro cuprate(III)