Question

Question: Write the $IUPAC$ name of the following
(I). $PtC{l_4}.5N{H_3}$ (gives $4$ ions in solution)
(II). $PtC{l_4}.2KCl$ (gives $3$ ions in solution)
(III). $IrC{l_3}.3N{H_3}$ (no $C{l^ - }$ ion is precipitated)
(IV). $CoC{l_3}.4N{H_3}$ m(one $Cl$is precipitated by $AgN{O_3}$ )

Answer 1

To name a coordination compound, no matter whether the complex ion is the cation or the anion, we always write the name of cation before the anion.

Complete step by step answer:
In chemical nomenclature, the $IUPAC$ nomenclature of chemistry is a systematic method of naming coordination compounds as recommended by the International Union of Pure and Applied Chemistry.
Rule for $IUPAC$ naming:
I.If the compound is salt, name of cation first then anion.
II.When naming a complex ion, name the ligand first then the metal.
III.Anionic ligand and in $- ido$ rather than $- ide$.
IV.A few neutral ligands have special names.
V.The name of the complex is a single word.
VI.Indicate the number of ligands with appropriate Greek prefix: di, tri, tetra, penta, hexa, etc.
VII.List ligands alphabetically.
VIII.If a ligand is polydentate or its name contains a Greek prefix, but the ligand name in parentheses and use the alternate prefixes, $\operatorname{bis} \left( 2 \right)$, $\operatorname{tris} - \left( 3 \right)$ , $\operatorname{tetrakis} - \left( 4 \right)$ , $\operatorname{pentakis} - \left( 5 \right)$ , $\operatorname{hexakis} - \left( 6 \right)$ etc. to specify numbers of each ligand.
IX.Use Roman numerals in brackets, right after the name of metal (no spaces), to specify the metal’s oxidation state.
X.If metal is in an anionic complex ion, use the ending –ate.
Point (II). can be explained as:
We can use ‘chlorido’ for $'Cl'$ , ‘cyanido’ for $'CN'$ and ‘hydro’ for $'H'$ .

I. Pentaamminechloroplatinum $\left( 2 \right)$ chloride.
II. Potassiumhexachloroplatinate $\left( 2 \right)$
III. Triammine trichloridium $\left( 3 \right)$
IV. Tetraamminedichlorocabaet $\left( 3 \right)$

Note:
The oxidation state and the coordination number reflect the number of bonds formed between the metal ion and the ligands in the complex ion. Oxidation states are typically represented by integers which can be positive, negative or even zero.