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 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 |
|---|---|---|
| Original solution + H₂S gas in presence of NH₄OH | Black precipitate is formed | Group IV cation may be present |
| Dissolve black precipitate in aqua regia | Nickel chloride solution is obtained | Ni²⁺ may be present |
| Confirmatory Test | ||
| Dimethylglyoxime Test Make the solution alkaline with NH₄OH and add dimethylglyoxime | Brilliant red precipitate | Presence of Ni²⁺ is confirmed |
The given salt contains Ni²⁺ as the cation (basic radical) and Br⁻ as the anion (acidic radical). The salt is Nickel(II) Bromide (NiBr₂).