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 |
|---|---|---|
| Original solution + Dilute HCl | White precipitate | Pb²⁺ may be present |
| Confirmatory Tests | ||
| Potassium Iodide Test Dissolve one part of the hot precipitate in hot water and add potassium iodide solution | Yellow precipitate is formed | Presence of Pb²⁺ is confirmed |
| Potassium Chromate Test To the acidified solution obtained above, add potassium chromate solution | Yellow precipitate is formed | Presence of Pb²⁺ is confirmed |
| Lead Sulphate Test Dissolve lead sulphide precipitate in dilute HNO₃, then add a few drops of dilute H₂SO₄ and alcohol | White precipitate of lead sulphate is formed | Presence of Pb²⁺ is confirmed |
The given salt contains Pb²⁺ as the cation (basic radical) and SO₄²⁻ as the anion (acidic radical). The salt is Lead(II) Sulfate (PbSO₄).