To determine the presence of anion and cation in the given salt
| Experiment | Observation | Inference |
|---|---|---|
| Confirmatory Test | ||
| Ammonium Molybdate Test Acidify with conc. HNO₃ and add ammonium molybdate solution, boil | Canary yellow precipitate is formed | PO₄³⁻ is confirmed |
| Experiment | Observation | Inference |
|---|---|---|
| Salt solution + NaOH solution | Dirty green precipitate | Fe²⁺ may be present |
| Confirmatory Test | ||
| Potassium Ferricyanide Test Add potassium ferricyanide solution | Dark blue precipitate (Turnbull's blue) | Presence of Fe²⁺ is confirmed |
The given salt contains Fe²⁺ ions as cation and PO₄³⁻ ions as anion. The salt is (Fe)₃(PO₄)₂.