1. Explain what is an emulsion. Why do you think emulsion take place? How can we
ID: 956716 • Letter: 1
Question
1. Explain what is an emulsion. Why do you think emulsion take place? How can we remove emulsion?
2. Choose the reagents which can be used to convert benzoic acid into sodium benzoate. Explain the reason with pKa values. NaH, NaCl, NaOH, NaHCO3, Na2CO3, Na2SO4
3. When we wash organic layers with water, it is convenient to use diethyl ether or ethyl acetate rather than dichloromethane or chloroform. Why?
4. The [BMIm]BF4 is an ionic compound which is synthesized from [BMIm]Cl and NaBF4. To synthesize [BMIm]BF4, [BMIm]Cl is mixed with NaBF4 in water. Although [BMIm]BF4 is an ionic compound, it is extracted with dichloromethane and washed with water. Why do you think it possible? What is washed with water? Explain in detail.
Explanation / Answer
(1) Emulsions are the colloids in which liquid dispersed phase is dispersed in liquid dispersion medium.
Ex: Milk, Ice, Blood, Fats
(2) Except NaCl, remaining all the reagents provided can convert benzoic acid to sodium benzoate.
(3) Oxygen containing solvents are more soluble in water because their ability to form H-bond. Hence generally diethyl ether or ethyl acetate are used rather than dichloro methan or chloroform.
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