Testing for Lipids
Biology: AQA A Level, topic 1.3.3
Emulsion Test
An emulsion is when small droplets of a substance are suspended in another solution. The emulsion test returns a positive result if a sample contains a lipid.
1) Add sample
- Place sample in a boiling tube with ethanol.
2) Shake solution
- Shake well and leave upright for 2-3 minutes.
3) Transfer solution
- Pour the solution into a boiling tube containing distilled water.
4) Observe results
- If a lipid is present, a white and milky layer will form.
Test yourself on Testing for Lipids
Steps of the Emulsion Test
What does a white, milky emulsion in the emulsion test show?
What is the name of the test shown in this diagram?