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Why is it so important to keep the silica gel saturated with solvent at all times...
1-) Silica gel has a bulk density of about 0.3 g/cm3, so 15 g would occupy...
1-) Silica gel has a bulk density of about 0.3 g/cm3, so 15 g would occupy a volume of 45-50 cm3 (45-50 mL). This quantity is called the: 2-) You are carrying out a chromatographic separation on a 15 mg sample using 6.5 g of silica gel in your column. If you aim for a column height of 10 cm of silica gel, what is the inside diameter of the necessary chromatography column in units of cm? 3-) Consider the...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
Why is important to keep the solvent level well above the sand in the column in...
Why is important to keep the solvent level well above the sand in the column in column chromatography?
3. If the TLC plate development had stopped before the solvent front reached the top of...
3. If the TLC plate development had stopped before the solvent front reached the top of the TLC plate (i.e. maybe it reached the middle of the TLC plate when it was stopped, instead): a) Would the Rf values have been affected? If so, how? If not, why not? Give a numerical example to support your answer. b) Would the size of the spots have been affected? If so, how? If not, why not? (Hint: think about the diffusion of...
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a....
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a. If Compound X has an Rf value of 0.7 and Compound Y has an Rvalue of 0.3, which compound is more polar? Explain. b. The solvent traveled 50 mm. How far did Compound Y travel? 2. Why isn't it reasonable for an R. value to be greater than 1? 3. How many spots would you expect to see if you conducted a TLC separation...
2 why is it important to keep the NAOH solution covered at all times? 0 How...
2 why is it important to keep the NAOH solution covered at all times? 0 How will the molarity of the NaOH solution be affected by its continued exposure to the atmosphere? 3. The pale pink color of the titration solution at the end point will fade to colorless after several minutes when exposed to the atmosphere. Account for this color change 4. What volume (in mL) of 0.0293 M Ba(OH)2 is required to neutralize 25.00 mL of 0.200 M...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
-Why was it so important to keep your glassware dry when synthesizing your Grignard? What happens...
-Why was it so important to keep your glassware dry when synthesizing your Grignard? What happens when your experiment is exposed to water? (Grignard Reaction Experiment)
Determine the yield limiting reagent and the theoretical yield for the following multistep synthesis from the reaction of ethyl acetoacetate. Draw the chemical complete chemical reaction and mechanism...
Determine the yield limiting reagent and the theoretical yield for the following multistep synthesis from the reaction of ethyl acetoacetate. Draw the chemical complete chemical reaction and mechanism of Product C (determined to be 4-hydroxy-4 4-diphenylbutan-2-one) to Product E provided the procedure below. Procedure Step 4B [Product C to Product E] Place product [C] (0.5 g) in a 50 mL round bottomed flask, add acetone (15 mL), and concentrated HCl (2.5 mL). Boil under reflux on a water bath for...
can you please answer all 1. When you run a TLC of the reaction in ethyl...
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...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a. If Compound X has an Rf value of 0.7 and Compound Y has an Rvalue of 0.3, which compound is more polar? Explain. b. The solvent traveled 50 mm. How far did Compound Y travel? 2. Why isn't it reasonable for an R. value to be greater than 1? 3. How many spots would you expect to see if you conducted a TLC separation...
2 why is it important to keep the NAOH solution covered at all times? 0 How will the molarity of the NaOH solution be affected by its continued exposure to the atmosphere? 3. The pale pink color of the titration solution at the end point will fade to colorless after several minutes when exposed to the atmosphere. Account for this color change 4. What volume (in mL) of 0.0293 M Ba(OH)2 is required to neutralize 25.00 mL of 0.200 M...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
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...
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