a liquid is added to ethanol, mixed well and added to water. a white emulsion layer forms.
Answers
A liquid is added to ethanol, mixed well and then added to water. A white emulsion layer forms. This indicates that the liquid contains lipids.
Lipids are natural organic substances such as fats, natural oils, etc. made up of large chains of carbon, insoluble in water, but soluble in alcohol.
1) This procedure tests the presence of lipids in a substance.
2) Lipids, when added to ethanol, dissolve in it.
3) On adding the solution to water, a white layer of lipid and water emulsion forms.
4) This is because the lipid molecules, which were initially insoluble in water are now dispersible in water, after being dissolved in ethanol.
5) These dispersed lipid droplets scatter the light passing through them, due to which the emulsion appears white.
6) The formation of a white emulsion confirms that the liquid contains lipids like fats, natural oils etc.