Question

The IUPAC name of $[Fe{({H_2}O)_6}]S{O_4}$ .

Answer 1

Coordination compounds are molecules that possess one or multiple metal centers that are bound to ligands (atoms, ions, or molecules that donate electrons to the metal). These complexes can be neutral or charged. When the complex is charged, it is stabilized by neighbouring counter-ions. A complex ion has a metal ion at its center with a number of other molecules or ions surrounding it.

Complete answer:
To name a complex, there are certain IUPAC guidelines. For a negative complex (anionic complex):
-First write the name of the central ion without writing its amount.
-Then give one space.
-Now write the amount of the ligand as well as its name.
-After this, the Latin name of the central atom is written along with its oxidation state.
-At last, the ion is written in roman numerals.
For a positive complex or neutral complex:
-First write the amount of ligand as well as its name.
-Now write the English name of the central atom as well as its oxidation state. Oxidation state should be in roman numerals.
-Give one space.
-At last, write the name of the second central atom or ion without specifying its amount.
In $[Fe{({H_2}O)_6}]S{O_4}$ , the iron atom plays the role of a central atom while the water molecule is a ligand. Hence, following the upper naming conventions, the name of the compound will be hexa aqua iron sulphate (II).

Note:
Hexa aqua iron sulphate (II) is a neutral complex. It will become a positive complex if sulphate ion is removed. The oxidation state of this positive complex is $2$ . Compounds which have a density of one are called monodentate or bidentate ligands. Water molecule is a monodentate and is neutral. Sometimes, in place of aqua, another name aquo can be used.