Structure of K3[Fe(CN)6]
The compound K3[Fe(CN)6] is known as potassium hexacyanoferrate(III) or potassium ferricyanide. Let's break down its structure in detail:

Potassium Ion (K+)
- K3[Fe(CN)6] contains three potassium ions, each with a +1 charge.
- These ions are located outside the coordination sphere of the central iron atom.

Hexacyanoferrate(III) Complex Ion ([Fe(CN)6)]3-)
- The central atom in this complex ion is iron (Fe) with a +3 oxidation state.
- The iron atom is surrounded by six cyanide ligands (CN-) in an octahedral arrangement.
- Each cyanide ligand is coordinated to the iron atom through the carbon atom.
- The complex ion as a whole carries a -3 charge due to the cyanide ligands.

Crystal Structure
- In the crystal lattice of K3[Fe(CN)6], the potassium ions are located around the [Fe(CN)6)]3- complex ions.
- The potassium ions balance the negative charge of the complex ion to maintain overall charge neutrality.

Overall Structure
- The overall structure of K3[Fe(CN)6] can be visualized as a repeating arrangement of [Fe(CN)6)]3- complex ions surrounded by potassium ions.
- This arrangement forms a three-dimensional crystal lattice.
This detailed explanation provides insight into the structure of K3[Fe(CN)6] and how the potassium ions and hexacyanoferrate(III) complex ions are arranged within the compound.