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 the salt and treat with concentrated H₂SO₄ | Colourless gas evolves and it etches glass | F⁻ may be present |
| Confirmatory Test | ||
| Calcium Chloride Test Treat salt solution with calcium chloride solution | White gelatinous precipitate forms | Presence of F⁻ is confirmed |
| Experiment | Observation | Inference |
|---|---|---|
| Original solution + H₂S gas in presence of NH₄OH | Black or flesh-coloured precipitate is formed | Group IV cation may be present |
| Confirmatory Test | ||
| Sodium Hydroxide Test Dissolve the precipitate in dilute HCl by boiling and add NaOH in excess | White precipitate forms first, then turns brown on standing | Presence of Mn²⁺ is confirmed |
The given salt contains Mn²⁺ as the cation (basic radical) and F⁻ as the anion (acidic radical). The salt is Manganese(II) Fluoride (MnF₂).