Qualitative analysis
How to do salt analysis · Viva · Quiz
To analyse the given inorganic salt for one acidic and one basic radical.
| 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 |
|---|---|---|
| Original solution + H₂S gas in presence of dil. HCl and NH₄Cl | Yellow precipitate is formed | Group-II-B (As³⁺) may be present |
| Confirmatory Test | ||
| Ammonium Molybdate Test Treat the dissolved precipitate with concentrated nitric acid and ammonium molybdate solution | Canary yellow precipitate is formed | Presence of As³⁺ is confirmed |
The given salt contains As³⁺ as the cation (basic radical) and F⁻ as the anion (acidic radical). The salt is Arsenic(III) Fluoride (AsF₃).