Flame emission spectroscopy measures the wavelengths of light given out by metal ions in a flame.
The table shows the wavelengths of the lines for four metal ions and for a sample.
| Substance | Wavelengths of lines (nm) |
|---|---|
| Lithium ions | 610, 671 |
| Sodium ions | 589 |
| Potassium ions | 404, 767, 770 |
| Calcium ions | 423, 616, 644 |
| Sample | 423, 616, 644 |
Which metal ion is in the sample?
Lithium
Sodium
Potassium
Calcium
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.