you are a ta in an organic lab and the students are running a column to seperate
ID: 860570 • Letter: Y
Question
you are a ta in an organic lab and the students are running a column to seperate the following compounds: trans-cinnamic acid and methyl cinnamate QUESTION 1: student a calls you over and explains that after running his colum and showing the rlc of his first 5 fractions, he collected the first spot removed the solvent and took a melting point. he is worried something is wrong because he got 38 C and not 133 C. how would you advise him? QUETION 2: Student b calls you over and aftetr collecting 25 fractions, only one spot came off. what would you advise her to do? explain
Explanation / Answer
A. Because only methyl cinnamate is extracted , boiling point ranges in between 34-38 degree celsius. Trans cinnamic acid lies in the range of 130-138 degree celisius. Increasing the polarity will make the trans- cinnamic acid run out of the fractions.
B. Increase in the polarity of solvent.
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