To determine the presence of anion and cation in the given salt
| Experiment | Observation | Inference |
|---|---|---|
| Take 0.1 g of salt in a test tube and add conc. H₂SO₄ (or add MnO₂ if needed) and warm | Reddish brown fumes of bromine are evolved | Br⁻ may be present |
| Confirmatory Tests | ||
| Layer Test Take 1 mL of neutralized extract, add CCl₄/CHCl₃ (or other suitable organic solvent), then add chlorine water dropwise and shake vigorously | Orange-brown colouration appears in the organic layer | Br⁻ is confirmed |
| Silver Nitrate Test Acidify sodium carbonate extract with dilute HNO₃ (or use water extract) and add AgNO₃ | Pale yellow precipitate | Br⁻ is confirmed |
| Experiment | Observation | Inference |
|---|---|---|
| Confirmatory Test | ||
| If group-V is absent, add disodium hydrogen phosphate solution and scratch the inner walls with a glass rod | A white crystalline precipitate of magnesium ammonium phosphate is formed | Mg²⁺ is confirmed |
The given salt contains Mg²⁺ ions as cation and Br⁻ ions as anion. The salt is Mg(Br)₂.