What is the advantage of using cyclohexane over hexanes in the TLC? Why do we often use hexanes instead? Please answer the cyclohexane part of the question. Thank you.
What is the advantage of using cyclohexane over hexanes in the TLC? Why do we often...
TLC Consider the following silica gel TLC plate of compounds A, B, and developed in hexanes: solvent front 0 D origin A B C 22. Determine the Ry values of compounds A, B, and Crun on a silica gel TLC plate using hexanes as the solvent. 23. Which compound, A, B, or C, is the most polar? 24. What would you expect to happen to the Ry values if you used acetone instead of hexanes as the eluting solvent? 25.TLC...
1) Why do we use a mixture of ethyl acetate and hexanes as solvents in the synthesis of 5,6-endo-dicarboxylic anhydride? 2) What do the terms exo and endo refer to? 3) Why do we not do any TLC on the product in the synthesis of 5,6-endo-dicarboxylic anhydride?
For TLC plate separation, why do we use Rf values instead of distance measurements (e.g. the spot travelled 5 cm from the starting line)? What would happen if we compared solvent systems using distances rather than Rf values?
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the elution solvents (hexanes or ethyl acetate) would not be visible under UV visualization?
can you please answer all 1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
How would a mixture of naphthalene and benzophenone behave on a TLC plate with hexanes / acetone as the eluent? Compare the polarity of these two compounds. Outline the most commonly used procedure for the purification of an impure solid material using the technique of recrystallization. Why is acetone such a popular solvent? Point out one drawback in terms of safety considerations. Your final product might be impure since you suspect decomposition might have occurred. When determining the melting point...
Post-Laboratory Questions Aspirin adnil tuleno Which compound turned out to be the most polar? The least polar? Do experimental results agree with your theoretical predictions? If not, why? 2. What would a chromatogram look like if a less polar developing solvent were used 3. Consider the following TLC plate of compounds A, B, and C developed in hexanes: solvent front starting line a) Determine the R values of compounds A, B, and C run on a silica gel TLC plate...
1- What are your thoughts on why means and standard deviations of returns are often connected to expected returns and risk in returns? Write 50 words 2- Why use the mean and standard deviation? Why not other indicators? Write 50 words 3- How often do you use basic statistical tools, e.g. means, standard deviations, or others, in your personal or professional activities? Write 50 words 4- What tools do you use, and for what purposes do you use them? Write...
Please help answer questions for esterification pre-lab. 4. Why do we use DMSO to prep the bio-sample rather than using Di water? (2 pts) 5. How does the KMnO4 stain detect the alcohol on the TLC plate? (2 pts)
2 Unit 1 The Fundamentals ADDITIONAL QUESTIONS 1 a. What is the advantage of a spread plate count over a simple hemocytometer count? b. Given your answer to (al, why would you do a hemocytometer count that is what is the advantage of this method over spread plating? 2. Why are counts expressed in CFU per milliliter instead of cells per milliliter? 3. If you want a final cell density in CFU per 10 ml, why do you apply only...