Question

if a gas chromotography sample was a mizture of two compounds and producesd a single peak,...

if a gas chromotography sample was a mizture of two compounds and producesd a single peak, how could you increase the resolution so that the two compounds are separated?

similarly, if an unknown sample gives one spot in TLC, how do you know that there is no guarantee that it is pure? how can you improve the analysis?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Question 1.

If use a narrower column or a longer column, or by trying different stationary phases, then you can increase the resolution so that the two compounds or separated.

Question 2.

If you decrease the polarity of the eluent for running TLC, or by using charring solutions to see the specific compounds (For example, iodine charring, anisaldehyde stain, or KMnO4 charring solution, etc.), then you can see a different spot which corresponds to another compound or impurity.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A GC sample of a mixture of two compounds produces a single peak in the chromatograph....
A GC sample of a mixture of two compounds produces a single peak in the chromatograph. Give two factors that you could change in the GC experiment to increase the resolution so that the two compounds are separated.
My Post Lab questions are asking me this about my caffeine experiment. "You perform a TLC...
My Post Lab questions are asking me this about my caffeine experiment. "You perform a TLC experiment on a product that you obtained in the lab. When you put it under the UV lamp, you see only one spot. Upon further analysis, however, you realize that there are actually two compounds in the sample. Give two reasons why this could happen, and then suggest how you could modify the experiment to overcome each one" I do not know why this...
A student separated two unknown compounds using Fractional Distillation followed by Gas Chromatography. The GC column...
A student separated two unknown compounds using Fractional Distillation followed by Gas Chromatography. The GC column had a non-polar liquid stationary phase and Helium was the mobile phase. Using the following data, determine the identity, boiling point and percent composition for each of the compounds in the GC sample. Explain reasoning. Your left peak has a percent composition of 20.49% and the right has 79.6%. Hexane boiling pint is 69.2 Heptane boiling boing is 98.5 Methanol is 65.1 Octane 126...
A gas chromatogram of the organic components of a sample of beer using a column that...
A gas chromatogram of the organic components of a sample of beer using a column that separated compounds on the basis of their relatives boiling points provides a GLC trace with several peaks. Two of the smaller peaks, with retention times of 9.56 and 16.23 minutes, are believed to be ethyl acetate and ethyl butyrate, respectively. c) The major component of the sample elutes first. What organic compound present in beer do you suspect is responsible for this peak? Is...
2) Besides a large spot and the TLC sample being too concentrated, what two other factors...
2) Besides a large spot and the TLC sample being too concentrated, what two other factors can cause the developed spots to appear as a streak? 6) In what case would column chromatography be used to purify a desired compound because techniques like recrystallization, extraction and distillation are not adequate to do so? 7) What will happen to the spots on a tlc plate if you use 2-propanol as an eluent instead of ethyl acetate? what makes ethyl acetate a...
You have a single sample two-tailed hypothesis test, population standard deviation unknown. The sample size is...
You have a single sample two-tailed hypothesis test, population standard deviation unknown. The sample size is small, n=10. a. Which test should you use? b. How would you calculate the significance level? Please just show equation. c. How would you calculate the p-value? d. When would you reject the null hypothesis (p-value and critical value)? Do not have data for this.
The presence of an impurity can affect the observed melting point of a sample in two...
The presence of an impurity can affect the observed melting point of a sample in two different ways: certain impurities can have only one, only the other, or both effects depending on what the impurity is and how much is present. What are the two effects (that is, how would the observed melting range change compared to the literature value of the pure substance)? a. b. One measures the amounts of lots of chemicals in a reaction, including those that...
1. What is the purpose of crystallization in an organic chemistry procedure? 2. Using the solubility...
1. What is the purpose of crystallization in an organic chemistry procedure? 2. Using the solubility data you found for benzoic acid, calculate the volume of water required to dissolve 1.0 g of benzoic acid at room temperature. Calculate the volume of boiling water needed to dissolve 1.0 g of benzoic acid. 3. Explain why a Büchner or Hirsh funnel is used to isolate the final crystallized product instead of stem funnel. 4. Explain when a mixture of solvents would...
T-tests are used when you want to examine differences but you do not know everything about...
T-tests are used when you want to examine differences but you do not know everything about the population. There are three types of t-tests that you may choose to do: one-sample t-test, independent sample t-test, or dependent sample t-test. You can calculate these by hand, in SPSS, or in Excel. The instructions below can be used for SPSS and your textbook offers instructions for using Excel. Single-sample t-tests These tests are used when you want to determine the probability that...
A solution of a theoretical triprotic acid was prepared by dissolving 4.037 g of solid in...
A solution of a theoretical triprotic acid was prepared by dissolving 4.037 g of solid in enough DI water to make 500.0 mL of solution.   10.11 mL of a 0.592 M solution was required to titrate 20.00 mL of this acid's solution. Part A What is the concentration of the acid solution? Part B What is the molar mass of the acid? Hint: You need to calculate the total moles in the 500.0 mL solution (the full 500.0 mL was...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT