When iron(III) ions (Fe³⁺) react with sodium sulfide (Na₂S), a precipitation reaction occurs, resulting in the formation of iron(III) sulfide.
The correct chemical formula for the precipitate is Fe₂S₃. This compound is known as iron(III) sulfide. During the reaction, two iron(III) ions will combine with three sulfide ions (S²⁻) to form the solid precipitate of iron(III) sulfide, which is typically a dark-colored substance.
The balanced chemical equation for this reaction can be expressed as:
2 Fe³⁺ + 3 S²⁻ → Fe₂S₃ (s)
Thus, the final precipitate formed in this reaction is iron(III) sulfide, represented by the formula Fe₂S₃.