Question

Question #0ed7c

Answer 1

What is `Fe^(3+)`? This is simply an iron atom that has lost 3 electrons.

Explanation:

`Fe^(3+)(aq)` is the `Fe^(3+)` cation in aqueous (water) solution. It is an `Fe^(3+)` nucleus surrounded by 6 water molecules, which could be represented as `[Fe(OH_2)_6]^(3+)`. This species acts as an acid in aqueous solution, and its colour often reflects its acid/base behaviour.

Answer 2

`Fe` is a transition metal. It has a variable valency. it has the electronic configuration: `[Ar] 3d^6 4s^2`. The orbitals `3d` and `4s` are close in energy and sometimes `Fe` (or more precisely the `4s` orbital) gives up the outer 2 electrons resulting in `Fe^+2` and sometimes the `3d` orbital also loses an electron alongwith the 2 electrons from `4s` orbital resulting in `Fe^+3`. `Fe^+3` is more stable than `Fe^2`, this is beacuse `Fe^+2` has more electron pair-electron pair repulsion in the `d` sub shell.