Answer: Because lipids are insoluble in water and soluble in ethanol. After lipids have been dissolved in ethanol and then added to H2O, they will form tiny dispersed droplets scatter light as it passes through the water so it appears white and cloudy.
Explanation:
The cloudy emulsion formed when lipids are dissolved in ethanol and then water is as a result of the light that are scattered by the tiny dispersed droplets as they pass through water.
The cloudy appearance that is formed when a substance is mixed with ethanol and water is an indication that there is presence of lipids in that substance.
This is a way of testing a if a substances contain lipids. First, the substance is dissolved in alcohol and later dissolved in water. The presence of lipids in the substance will an emulsion in form of precipitate. This often appears cloudy.
Lipids are generally not soluble in water but are soluble in alcohols. Ethanol is an alcohol.
The tiny droplets that are formed when lipids are dissolved in ethanol before being mixed with water scatters light as they pass through water. This is what is responsible for the emulsion that appears cloudy.
Therefore, the cloudy emulsion formed when lipids are dissolved in ethanol and then water is as a result of the light that are scattered by the tiny dispersed droplets as they pass through water.
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