To determine the presence of anion and cation in the given salt
| Experiment | Observation | Inference |
|---|---|---|
| Universal Indicator | Solution turns blue or purple | OH⁻ may be present |
| Confirmatory Test | ||
| Phenolphthalein Test Add phenolphthalein indicator to salt solution | Solution turns pink | OH⁻ 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 OH⁻ ions as anion. The salt is Cu(OH)₂.