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I need to get the rf valuse from a made up value and draw a tlc plate of 30% ethyl actate and 70% peterloume ether
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- The result of the TLC analysis of the reaction between reagents A and B is shown in Figure 2. Mark the conclusions that can be drawn from the TLC plate. * a) Reagent B is not pure. b) The reaction forms three products. c) The reaction has run to completion.According to the following TLC, choose all compounds that are present in the crude sample, before recrystallization? 1 methyl benzoate 2 triphenylmethanol 3 a non-polar impurity such as biphenylYou decided to check the purity of your product by TLC. You spotted salicylic acid (lane 1), your crude synthetic aspirin (lane 2) and a sample of pure aspirin (lane 3). After elution, draw a picture of what developed TLC plate (UV visualization) would look like?
- If TLC is performed with 1:4 v/v ethyl acetate:hexane in a TLC chamber and the spots are 4-bromobenzaldehyde, diethyl benzylphosphonate, reaction mixture if wittig reation( 4-bromobenzaldehyde , diethyl benzylphosphonate and potassium etoxide), crude product of this Wittig reaction and purified product of wittig reaction. How will you predict the movement of the spots and thier Rf values. Include a brief explanation for your predictions.A TLC analysis is performed on both crude and purified biphenyl. Upon visualization under the UV- lamp both spots remain at the baseline. This is likely because: a. Biphenyl is a polar molecule and therefore should remain at the baseline upon TLC plate development in the proper eluent. b. The samples were not spotted properly on the TLC plate. c. The solvent was too non-polar. d. The solvent was too polar. e. The solvent evaporated before the TLC plate could be added to the chamber.In what order would the following compounds be eluted on a silica gel TLC plate if they are spotted on the same plate and developed in a solvent mixture of 10:1 hexanes:ethyl acetate A. 1 has the highest Rf value, then 2 then 4 then 3 b. 4 has the highest Rf value, then 1 then 3 then 2 c. 3 has the highest Rf value, then 2 then 1 then 4 d. 2 has the highest Rf value, then 3 then 1 then 4
- Experiment 2 - Extraction Procedure The procedure[1] has been outlined below. Add details if needed so that you are able to complete the experiment in lab using only this document. The following chemicals may be encountered during this experiment: Acetylsalicylic acid Sucrose Acetanilide Ethyl acetate Sodium bicarbonate (NaHCO3) Hydrochloric acid (HCl) Sodium sulfate (anhydrous) Dissolve phensuprin (0.5 g) in ethyl acetate (25 mL). Measure out 0.5-1.0 g of phensuprin and put it in a beaker (100 mL) along with 25 mL of ethyl acetate. Stir for 1-3 min, breaking up any chunks as needed Sucrose will not dissolve, but everything else will. Gravity filter the solution to collect the sucrose. Set up a glass funnel in a ring or clamp, so that it will drain into a clean Erlenmeyer flask (125 mL). Put a fluted filter paper into the funnel and "wet" it with ethyl acetate. Optional: Weigh the filter paper before using it. Swirl and pour the solution into the funnel, being…Every spot on a student's TLC plate has an Rf value from 0.1 to 0.2. The student used a 10% ethyl acetate 920%0% pentane mixture as the eluting solvent. What composition might yield better Rf values for separating the compounds? 100% pentane 5% ethyl acetate and 95% pentane 20% ethyl acetate and 80% pentanePinacl-Pinacole lab What visual criterion is to be used to assess whether the crude reaction product is dry prior to semimicro distillation?
- A student completes their TLC experiment, but can not visualize any spots on their plate under a UV lamp. What advise would NOT be very helpful to this student? Make sure your compound actually absorbs UV light. You can check your spots under a lamp before running the TLC. Make sure your spot line is not getting submerged with solvent. If the spots are submerged, they will get dissolved before the TLC has run. Try to spot more sample on the spots using more repititions of spotting or a more concentrated spotting solution. Try to use a more polar eluting solvent.SEE PHOTO: Effectiveness of separation. Based on the TLC analysis, did the isolated benzoic acidappear pure relative to the starting mixture? Did the isolated naphthalene look pure?How could the purity of the isolated materials be improved? In the picture: Aq- is Benzoic acid O- is Naphthalene both- is both Benzoic acid and Naphthaleneif you wanted to makes the spots travel up the TLC plate further, what solvent ration would you choose and why? 1:2 Ethyl acetate/Hexane, 2:3 Ethyl acetate/ Hexane, or 1:1 Ethyl acetate/Hexane