A solution contains sodium ions and one or more types of negative ion. A student does some tests.
| Test | Result |
|---|---|
| Add excess dilute nitric acid to a sample | Fizzes and the gas turns limewater milky |
| Then add silver nitrate solution to the same sample | White precipitate |
| Add dilute hydrochloric acid, then barium chloride solution, to a fresh sample | No precipitate |
Which negative ions are in the solution?
Carbonate ions only
Carbonate ions and chloride ions
Chloride ions and sulfate ions
Carbonate ions, chloride ions and sulfate ions
107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.