231L Ketone Reduction

The solvent level in the development chamber should be above the level of the spotted compounds on the TLC plate. Group of answer choices True False

DATA REPORT FORM Procedure A: Ink Analysis by Paper Chromatography 1. Attach the chromatography paper results here. Name 2. Calculate the Rf value for each ink/marker sample. If there are more than one spot in the sample, calculate and list Rf for all components. Procedure B: Identification of Unknown Analgesic Drugs 1. Sketch the best results of the TLC plate here, including unknown sample and known compounds. 11

Peak Retention Time (minutes) Area 1.201 136501204 acetone 2.011 1253056 toluene ortho-product para-product 3.201 8340750 3.350 14890645 a) What was the relative percent yield of the ortho-product? b) What was the relative percent yield of the para-product? c) What was the relative percent yield of the product?

6) You are given a mixture of organic compounds suspected of containing various amines (e. g. 4-chloroaniline). What is the best way to quickly separate these amines from the other organic compounds? a) Perform a fractional distillation on the mixture. b) Benchtop silica gel column chromatography. c) Dissolve the mixture in an organic solvent and treat the solution with aqueous HCI. d) Dissolve the mixture in an organic solvent and treat the solution with aqueous NaOH.

Separation of Amino Acids by Thin Layer Chromatography Lab Questions. Please see photos and answer the questions relating to the images from #10. Thank you!

In HPLC, why is purging being done before analysis of samples. Outline the procedure on how purging is performed.

What is the result of applying too much sample to the TLC plate? Select one: Some of the sample moves down instead of up Reduced separation between the spots O The sample moves past the solvent front O The spot does not leave the origin O The sample leeches out into the elution solvent

! (give detail reason for your correct choice)

A thermal conductivity detector (TCD) is used in a) HPLC b) GC c) size exclusion chromatography d) capillary electrophoresis

Question attached :)

ve After performing a reaction a TLC plate was run to identify the product. Below is the completed TLC plate. In lane A are the starting materials. In lane B is the sample taken after the reaction was complete. Did this reaction go to completion? Defend your answer with the TLC results. Edit View Insert Format Tools Table 12pt Paragraph BIUA V > 2 T²:

There were 2 spots on the TLC that did not match up with any of the standards. What were the Rf values of these spots? Identify what these chemical species might be and draw their structures. Solvent was 3:1:1 n-butanol/acetic acid/water. First plate is TLC plate 1. Second plate is TLC plate 2.

How you can improve resolution in HPLC analysis

a quick answer is good?

what is the purpose of TLC Separation & Analysis of Analgesics?

Organic Chemistry, Column questions

I'm doing lab report for thin layer chromatography right now, but I'm struggling with a question about how the polarity affect separation. Please help me answer and explain it. Thank you so much!

What are the elution techniques usually followed in HPLC?

What is the best solvent system for TLC that would elute this compound? And why is that solvent mixture is appropriate?

What is the purpose of thin layer chromography lab? What is a hypothesis I can use when conducting a TLC lab and how can that hypothesis be tested?

Need help with a and b.    A mixture of 1-hexanol, hexane, and 1-chlorohexane is injected on a gas chromatography column. a) Predict the sequence of retention times indicating which compound will have the shortest, middle, and longest retention time. b) The sample vial of (a) was not carefully sealed and left partially open for a couple hours. A GC is taken again with only two peaks realized. The first peak to appear has an area of 24 mm2 and the second peak 40 mm2. What mole% of each compound (specify the compound name) is most likely present?

1. Which property of compounds is responsible for the separation in a TLC? Explain with an example.2. How does the separation occur during a TLC? (Hints: TLC plate and silica layer)

What is the probable cause of the sample streaking across the TLC plate from origin to solvent front.a. Too much sample b. Too little sample C. A developing solvent that is too polar d. A developing solvent that is too non polar

Can you help me answer these questions?