A technician tests separate portions of cooling water from an industrial process.
| Test | Reagents added, in order | Result |
|---|---|---|
| 1 | dilute nitric acid, then silver nitrate solution | no precipitate |
| 2 | dilute hydrochloric acid, then silver nitrate solution | white precipitate |
The technician concludes that the cooling water contains chloride ions.
Explain why the technician should reject this conclusion. Use both test results in your answer.
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.