explain why the emulsions were of the type observed Bio 205 Phase Reversal of an
ID: 154081 • Letter: E
Question
explain why the emulsions were of the type observed Bio 205 Phase Reversal of an Emulsion Materials:, Oil tia suspendeSudan Powder Procedure: Place 3 ml. of oil, 3ml. of 0.1M NaOH, and a small amount of 0.1M NaOH, 0.1M CaC12 s aroe ar 5 ml pipettes Sudan in a tube. Shake vigorously and note the color of the emulsion that is formed. Use microscope to confirm. Now add to the emulsion 3 ml. of 0.1 M CaC12, shake, and note the color as before. Observe upper layer only. Use microscope to confirm. Since Sudan is fat soluble, the emulsion will be bright red when oil forms the continuous phase, pink when water forms the continuous phase. Questions: 1. What type of an emulsion was present before the addition of CaC12? oil in water water in oil (encircle) 2. What type of an emulsion was present after the addition of CaC12? oil in water water in oil (encircle) 3. Explain why the emulsions were of the type observed. s.Explanation / Answer
There are two basic types of emulsions: oil-in-water and water-in-oil. In every emulsion there is a continuous phase that suspends the droplets of the other element which is called the dispersed phase. In an oil-in-water emulsion, the continuous phase is the water and the dispersed phase is the oil while in a water-in-oil emulsion the oil is the continuous phase. The type of emulsion does not depend on the actual amounts of oil and water present in an emulsion. For example, vinaigrettes are oil-in-water emulsions even though there is more oil in a vinaigrette than water (vinegar).
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