To determine the presence of anion and cation in the given salt
| Experiment | Observation | Inference |
|---|---|---|
| Take the salt and treat with concentrated H₂SO₄ | Colourless gas evolves and it etches glass | F⁻ may be present |
| Confirmatory Test | ||
| Calcium Chloride Test Treat salt solution with calcium chloride solution | White gelatinous precipitate forms | Presence of F⁻ 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 F⁻ ions as anion. The salt is Fe(F)₂.