Iron(III) Hydroxide

* Iron(III) indicates the iron ion has a +3 charge: Fe³⁺

* Hydroxide is the polyatomic ion OH⁻ with a -1 charge.

* To balance the charges, we need three hydroxide ions for every iron ion.

* Molecular formula: Fe(OH)₃

Perchloric Acid

* Perchloric acid is a strong acid with the formula HClO₄.

Note: The term "molecular formula" is generally used for covalent compounds. While perchloric acid is an ionic compound, the formula HClO₄ is still commonly referred to as its molecular formula.