GCSE · Chemistry · AQA · Spec 8462
Flame emission spectroscopy
From sample to spectrum
Follow what happens to the emitted light and what the result tells you.
- Sample enters the flameIn flame emission spectroscopy, the sample is put into a flame so that it gives out light.
- Light reaches the spectroscopeThe emitted light is passed through a spectroscope so it can be analysed.
- A line spectrum appearsThe instrument produces a line spectrum rather than relying only on the visible flame colour.
- Compare with referencesThe result can be interpreted by comparing it with an appropriate reference set presented in the same form.
- Identify the ionsAnalysis of the line spectrum can reveal which metal ions are present in the solution.
- Measure concentrationThe line spectrum can also be used to measure the concentrations of metal ions in the solution.
Five flame-test colours
Learn each ion and colour as one pair.
Interpret the result
Use only the supplied reference information.
An unknown solution produces a line spectrum that exactly matches Reference B. The supplied reference set labels B as calcium. What should you identify in the unknown?
Relationship matrix
Tap any cell to reveal it. Tap a column header to read one property down every item.
Each cell hides a short answer and the reason behind it. Predict before you tap.
Spectroscopy essentials
Keep the method, output and interpretation vocabulary precise.
WHAT YOU'VE LEARNED
A quick recap of today's lesson.
Use flame colours and line spectra to identify metal ions and analyse solutions.
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