A TLC of an organic solid (acetyl salicylic acid, aspirin) was run in 4 different eluents. Using your knowledge of TLC and polarity of these eluents, match the Rf of the aspirin to the eluent. 0.01 [Choose) 100% ethanol 90% hexanes, 10% ethanol 60% hexanes, 40% ethanol 100% hexanes 0.23 0.48 [Choose) 0.91 [Choose]

Question 6 1 pts When building a column, a plug of glass wool is placed in bottom of the column, then the column is filled with eluent, followed by a layer of sand, then the adsorbent (alumina or silica), another layer of sand. What is the purpose of each layer? glass wool [Choose ] plugs opening at bottom of column, prevents solids from clogging the stopcock helps keep the top of the column level and intact helps separate the mixture based on polarity of compounds in the mixture provides a level support for the column of adsorbent eluent and adsorbent (alumina or silica) bottom layer of sand [Choose) top layer of sand [Choose