This question is about chemical analysis.
A student tested copper(II) chloride solution and sodium sulfate solution using flame tests.
This is the method used:
What flame colour is produced by copper(II) chloride solution?
Sodium compounds produce a yellow flame colour. The student left out an important step before reusing the metal wire. As a result, the student’s method did not produce a distinct yellow flame colour using the sodium sulfate solution. Explain why.
The student added sodium hydroxide solution to:
Give the results of these tests.
To test for chloride ions, the student added dilute nitric acid to copper(II) chloride solution. Name the solution that would show the presence of chloride ions when added to this mixture.
To test for sulfate ions, the student added dilute hydrochloric acid to sodium sulfate solution. Name the solution that would show the presence of sulfate ions when added to this mixture, and give the result of the test.
29 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.