1. Identify the Ions:
* Iron (III): This means the iron ion has a +3 charge (Fe³⁺).
* Phosphite: This is the polyatomic ion PO₃³⁻.
2. Balance the Charges:
To create a neutral compound, the charges of the ions must balance. Since phosphite has a -3 charge and iron (III) has a +3 charge, we need one of each to balance:
* Fe³⁺ + PO₃³⁻ → FePO₃
Therefore, the formula for Iron (III) Phosphite is FePO₃.
