system for these four compounds, hexane had to have a higher ratio compared with ethyl acetate. The result was at least 90 hexane: 10 ehtyl acetate for the compounds to …
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which solvent system for TLC was the best in determining the unknown mixtures of analgesics? why? the 10:1 ethyl acetate to hexane mixture the polarity of ethyl acetate was offset by the highly nonpolar portion of hexane. this caused the two more polar compounds to travel less and differentiate more by associating with the polar plate, while .
First spotting is done on the plate where a solution is spotted (the volatile solvent quickly evaporates leaving just the solute) and the gel is placed in a solvent which moves up the plate by capillary action. The liquid solvent is the mobile phase and the plate is the stationary phase.
How to Make a Transfer Print : Transfer Printmaking . the most common forms of transfer printmaking today involve photocopies or laser printer printouts. The techniques we have so far discovered seem to give the best results with these toner-based original copies. The reason for this lies in …
Label each plate with the appropriate solvent system. Include R f values for each plate. 2. (a) Which solvent system gave the best results? Explain. (b) What was wrong with the other solvent systems? Explain. 3. Describe how the polarity of the solvent system affected the number and color of spots that were observed. 4.
For a piece of work I'm doing, I use a formula that calculates the difference between two dates for each row in the report that the system generates. Essentially, the software I'm using generates the report and my formulas/logic are performed on the original report, going row by row, to create a second report.