Question

Oil soluble dye is mixed with water in oil emulsion, then:
A. dispersion medium is coloured
B. dispersed phase is coloured
C. both are coloured
D. none is coloured

Answer 1

Hint: Two immiscible liquids are allowed to mix together to generate a stable colloid or emulsion. The two components are distinct yet cannot be separated from one another.

Complete step by step answer: Emulsion is a mixture of two immiscible liquids which forms a stable mixture. One of the liquids is called dispersed phase and the other dispersion medium.
When oil and water (both are liquids) are mixed to generate an emulsion, two types of emulsion are formed. One is oil in water and another is water in oil. Milk is an emulsion of oil in water while margarine is an emulsion of water in oil.
In oil in water (O/W) emulsion the dispersed phase is oil and dispersion medium is water. In water in oil (W/O) emulsion, the dispersed phase is water and the dispersion medium is oil.
In this case the dye is oil soluble. So when it is allowed to mix with water in oil emulsion, the dye will get soluble in the oil of the emulsion and the water will not undergo any change.
Since for water in oil emulsion the water in dispersion phase and oil is dispersion medium, the dispersion medium gets coloured. So the correct answer is option A.
So, the correct answer is “Option A”.

Note: Emulsions are useful for a variety of purposes. They are immiscible so the use of emulsions in medicine allows them to remain in the body for a longer period of time. Another important use of emulsions is the preparations of polymers, because coagulation of polymers can be avoided.