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 |
|---|---|---|
| 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 + Dilute HCl | No reaction | Group I cation is absent |
| Original solution + Dilute HCl + H₂S gas (with NH₄Cl) | No reaction | Group II cation is absent |
| Original solution + Dilute HCl + NH₄Cl solid + NH₄OH | No reaction | Group III cation is absent |
| Original solution + NH₄Cl + NH₄OH + (NH₄)₂CO₃ | White precipitate is formed | Group V cation may be present |
| Confirmatory Tests | ||
| Flame Test Moisten the salt with conc. HCl and introduce it into a non-luminous flame | Brick-red flame | Ca²⁺ is confirmed |
| Ammonium Oxalate Test Dissolve white precipitate in dilute acetic acid and add ammonium oxalate solution | White precipitate of calcium oxalate | Ca²⁺ is confirmed |
The given salt contains Ca²⁺ as the cation (basic radical) and PO₄³⁻ as the anion (acidic radical). The salt is Calcium Phosphate (Ca₃(PO₄)₂).