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 Tests | ||
| If no earlier anion test is positive, acidify the extract with dilute HCl and add BaCl₂ solution | White precipitate of barium sulphate, insoluble in conc. HCl or conc. HNO₃ is obtained | SO₄²⁻ may be present |
| Lead Acetate Test Acidify the solution with acetic acid and add lead acetate solution | White precipitate appears | Presence of SO₄²⁻ is confirmed |
| Experiment | Observation | Inference |
|---|---|---|
| Flame test in a clean non-luminous flame | Lilac flame | K⁺ may be present |
| Confirmatory Test | ||
| Sodium Cobaltinitrite Test Salt solution + sodium cobaltinitrite reagent | Yellow precipitate | K⁺ is confirmed |
The given salt contains K⁺ as the cation (basic radical) and SO₄²⁻ as the anion (acidic radical). The salt is Potassium Sulfate (K₂SO₄).