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 |
|---|---|---|
| Original solution + H₂S gas in presence of dil. HCl | Black precipitate of Group-II A is formed | Group-II cation may be present |
| Confirmatory Test | ||
| Potassium Ferrocyanide Test Dissolve the black precipitate in dilute nitric acid, boil the filtrate and then add potassium ferrocyanide | Chocolate brown precipitate | Presence of Cu²⁺ is confirmed |
The given salt contains Cu²⁺ ions as cation and PO₄³⁻ ions as anion. The salt is (Cu)₃(PO₄)₂.