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Laboratory 3 M&S
Alejandra Jimena San
Created on April 15, 2021
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Transcript
Start
Laboratory 3Functional Group Identification
Matter and Sustainability EM21
Welcome back! We are so glad to see you around here again
We need your help with some experiments to test organic functional groups
In this lab, you will study how to identify a functional group in a molecule. To do this, you will carry out 4 different tests:
- Baeyer's test
- Alcoxide formation
- Tollens' test
- Neutralization
Objective
Read the instructions carefully
Instructions
- Download the document in Canvas "Laboratory 3 Functional group identification" and read it carefully.
- Browse this interactive lab and make the 5 tests of this experiment.
- Record your results in the tables and answer the questions in the document.
- Convert the document to a PDF and submit your work in Canvas.
Open your notebook to consult the functional groups
Matter &Sustainability
FuntionalGroups
Info
Ketones and aldehydes
Alcohol
A silver mirror is formed on the walls of the test tube
A gas is released in a vigorous reaction
A red-brownish solid appears
Changes observed when possitive
Functional G
TEST
Formation of bubbles (a gas is produced)
Alkenes
Take a screenshot and paste it in your worksheet
Drag the box to the correct place
Carboxylic acid
Neutralization
Alkoxide formation
Complete the following table with the correct information
Tollens' test
Baeyer's test
Previous knowledge
Alcohol
Ketones
Alkenes
Aldehydes
Alkoxide formation
Neutralization
Baeyer's test
Carboxylic acid
Tollens' test
Molecule
Functional G
TEST
Take a screenshot and paste it in your worksheet
Drag the box to match the molecule and the functional group with the correct identification test.
Previous knowledge
What image shows a positive result in the identification of an Aldehyde or Ketone using the Tollens reagent?
Test your knowledge
Next
Yes!, the formation of a silver mirror is a positive result of the Tollen's test
Test your knowledge
Sorry :(A transparent color is not a positive result of the Tollens' test
Test your knowledge
Return
What image shows a positive result in the identification of a carboxylic acid in a neutralization test using sodium bicorbonate?
Test your knowledge
Next
Yes!, the formation of bubbles (gas release) is a positive result of the neutralization test
Test your knowledge
Sorry :(A transparent color is not a possitive result of a neutralization test
Test your knowledge
Return
What image shows a positive result in the identification of an Alkene using the Bayer's reagent?
Test your knowledge
Next
Yes!, the formation of brownish precipitate is a positive result in the Baeyer's test
Test your knowledge
Sorry :(A purple color is not a positive result of the Baeyer's test
Test your knowledge
Return
What image shows a positive result in the identification of an alcohol using sodium to form an alcoxide?
Test your knowledge
Next
Yes!, the formation of bubbles (gas release) is a positive result to identify an alcohol using sodium.
Test your knowledge
Sorry :(A transparent color is not a positive result to identify an alcohol!
Test your knowledge
Return
Now, you will beging with the experimental part. Remember you will carry out 4 tests to identify functional groups in known subtances
Hexene
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1. Add ten drops of hexene to a test tube.2. Then, put three drops of Baeyer’s reagent into the test tube containing the hexene.Observe the changes in the test tube and register your results in your worksheet.
Baeyer's reagent
First test: The Baeyer's Test
Tollen's reagent
Acetone
1. Pour 100 mL of tap water into a 250 mL beaker, place the beaker on the hot plate and heat until water starts boiling.2. Put 1 mL of acetone in the test tube and and place the tube into the beaker with the hot water, for about 2-3 minutes. 3. Add three drops of Tollens’ reagent to the tube.Register the results in your worksheet.
Second test: The Tollens' Test
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Tap water
Ethanol
1. Into a DRY test tube put 1 mL (about 20 drops) of ethanol. 2. Put a little piece of metallic sodium.Observe and register the results in your worksheet.
Third test: Alkoxide formation
Metalic sodium
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Acetic acid
Sodium bicarbonate solution
1. Put 1 mL (about 20 drops) of acetic acid into a test tube. 2. Add 5 drops of a solution of sodium bicarbonate, stir vigorously and register all changes Observe and register the results in your worksheet.
Fourth test: Neutralization
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To finish this lab, you will carry out the last 4 tests to a unknown sample to find out what functional groups are present
Tollen's reagent
Sodium bicarbonate solution
Fifth test: Unknown sample
According to the results, you have to deduce the functional groups present in the household chemical (unknown sample)
this is the unkown sample
Metalic sodium
Baeyer's reagent
Put the mouse over each test tube to see the changes after adding the different reagents
Do not forget to complete the document and submit it to Canvas
Congratulations! You finished this laboratory activity