spring 20 Name: You are extracting a mixture of 3 compounds (shown below) dissol
ID: 1040414 • Letter: S
Question
spring 20 Name: You are extracting a mixture of 3 compounds (shown below) dissolved in ether into various aqueous solutions. Compound 3 Compound 1 Compound 2 (1). Which compound will be extracted into 3M NaOH. (a) Compound 1 (b) Compound 2 (c) Compound 3 (d) All of the above (e) None of the above fairly impure sample of the same compound (75% purity)? Assume the impurity is embedded in the solid of your sample) (2) What would be the difference between the melting point range of a pure compound (-99% purity) versus a (a) The purer compound's melting point range would by lower (b) The impure compound's melting point range would by lower (c) The purer compound's melting point range would by broader d) The impure compound's melting point range would be higher (3). Why does the fractionation column make fractional distillation more efficient? o) It allows distilled vapors to continuously condense and vaporize (e) It increases the boiling point (d) it makes distillation faster (4). On what basis does gas chromatography separate compounds? (a) How the machine feels that day (b) volatility (c) melting point (d) color (5). Generally how do we cause a compound to crystallize?Explanation / Answer
Answer 1: (a) Compound 1 i.e., Benzoic acid
Explaination: Acid compounds only sepaarated by Base treatment.
Answer 2: (d) The impure compound melting point range would become higher
Explaination: As the impurity will disturbs the uniform response of the pure compound at any particular point of temperature to absorb and hence range increases.
Answer 3: (a) It allows distilled vapours to continuously condense and vaporize
Explaination; Obeys and successfully folows raoults law
Answer 4: (b) Volatility
Explaination: Gas chromatography separates compounds based on volatility of a compound and its interaction with the stationary phase.
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