Question

When soap or detergent is added to water, which of the following is true?

• A. This results in formation of oil in water type emulsion.
• B. This results in formation of water in oil type emulsion.
• C. This results in formation of either oil in water type emulsion or water in oil type emulsion.
• D. No emulsion is formed.

Answer 1

The correct option is A This results in formation of oil in water type emulsion.

When soap or detergent is added to water, this results in the formation of oil in water type emulsion.
The polar water-soluble ( hydrophilic) head is on the surface of the micelle whereas non-polar oil soluble (hydrophobic) tail is in the centre of the micelle. In the centre of the micelle, small oil droplets are present in which hydrophobic part of micelle dissolves.