A geologist tests two portions of an extract from a mineral sample.
| Portion | Treatment before adding silver nitrate solution | Observation |
|---|---|---|
| A | None | White precipitate |
| B | Dilute nitric acid added first | White precipitate |
Explain what can be concluded from the result for portion B and why the result for portion A alone would not establish the same conclusion.
93 exam-style questions on AQA GCSE Chemistry 8.3 Identification of ions by chemical and spectroscopic means, covering 8.3.1 Flame tests, 8.3.2 Metal hydroxides, 8.3.3 Carbonates, 8.3.4 Halides, 8.3.5 Sulfates, 8.3.6 Instrumental methods, and 8.3.7 Flame emission spectroscopy. Each one has a worked solution and a mark scheme showing where the marks go.