[PDF] pdf Aldehyde and Ketones english PDF ORG_Aldehydes_Ketones_pdf

In this experiment, we will test for the carbonyl group This can be Conclusion: The presence of an aldehyde and ketone group Both aldehydes and ketones

Aldehydes and Ketones represent an important class of organic molecules containing a carbonyl carbon In this experiment you will study the chemical properties

[PDF] Organic Compounds Test Lab Report Conclusion

27 jan 2021 · read organic compounds lab report free essay and over 89 000 other was to determine the reactions of aldehydes and ketones aldehydes and ketones

[PDF] Experiment – Identification of Aldehydes and Ketones

Aldehydes and ketones both undergo a reaction type known as nucleophilic addition Under less acidic conditions, in this type of reaction a nucleophile (a species

[PDF] Experiment 6 Reactions of Carbonyl Compounds: Qualitative

With the same reagent, aldehydes usually react faster than ketones, mainly because there is less crowding at the carbonyl carbon Aldehydes are also more easily

[PDF] pdf Aldehyde and Ketones english

In this experiment, we will test for the carbonyl group This can be Conclusion: The presence of an aldehyde and ketone group Both aldehydes and ketones

[PDF] Identification of an Unknown – Alcohols, Aldehydes, and Ketones

In this experiment, you will be asked to identify an unknown liquid, which will be either an alcohol, A list of alcohols, aldehydes, and ketones, along with the MP of a solid A discussion on derivatives will be given later in this handout The

[PDF] LABORATORY MANUAL FOR ORGANIC CHEMISTRY I

Lab Manual 1 INTRODUCTION Getting started Clean glassware is essential for good results in the organic chemistry laboratory Even aldehyde or ketone, however, has only alkyl or hydrogen substituents and thus can't usually expel a

[PDF] Lab 14: Qualitative Organic Analysis - California State University

In this experiment you will determine the identity of an unknown compound one major functional group (alcohol, ketone, aldehyde, amide, amine, carboxylic

[PDF] Organic Compounds Test Lab Report Conclusion

14 jui 2018 · Lab Report Determining Reactions Of Aldehydes And Ketones Introduction Discussion Chemhaven Org Tests For The Functional Groups

Test for Aldehydes and Ketones

D escription: Aldehydes and Ketones are compounds containing the carbonyl group. The carbonyl group consists of a carbon atom bonded to oxygen atom by a double bond. In Aldehydes, the carbonyl carbon is attached to at least one hydrogen atom and to a carbon containing group (aliphatic or aromatic radical), but in ketones,the carbonyl carbon is attached to two aliphatic or aromatic gro ups. In this experiment, we will test for the carbonyl group. This can be investigated using 2,4-dinitrophenylhydrazine, where this reagent reacts with carbonyl group, forming Phenylhydrazines. Phenylhydrazines are colored compounds "red , yellow or orange " according to aldehydes or ketones.Then we will differentiate between aldehydes and ketones by performing Tollen's Test, Schiff's Test and Fehling's Test. Aim: Identification of aldehydic and ketonic functional groups and differenti ating between both groups.

Learning objective:

- Identify aldehydic and ketonic functional groups in organic compounds by performing 2,4-dinitrophenylhydrazine test. - Differentiating between aldehydes and ketones by Tollen's, Schiff's Test and Fehling's Tests.

Materials and equipment:

- 2,4-Dinitrophenylhydrazine reagent - 2,4-dinitrophenylhydrazine - Concentrated sulfuric acid - Stoppered bottle - Benzaldehyde - Acetone - Sodium bisulfite - Triphenylmethane dye - Activated Charcoal - Fehling's A - Fehling's B

Procedure:

2,4-Dinitrophenylhydrazine Test

1. Prepare 2,4-Dinitrophenylhydrazine reagent by dissolving 1 gm of

2,4-dinitrophenylhydrazine in 5.0 mL of concentrated sulfuric acid in a

beaker then add 7.0 mL water and 25 mL 95% ethanol then stir the solution.

2. Transfer the solution from the beaker to stoppered bottle and place label

2,4-Dinitrophenylhydrazine reagent.

3. In a test tube dissolve 3 drops of benzaldehyde in 2 mL 95% ethanol.

4. In another test tube dissolve 3 drops of acetone in in 2 mL 95% ethanol.

5. Add 2 mL of the 2,4-dinitrophenylhydrazine reagent you just prepared to

both tubes. Observation: The formation of yellow precipitate in both tubes. Conclusion: The presence of an aldehyde and ketone group. Both aldehydes and ketones give yellow or orange precipitate with

2,4-dinitrophenylhydrazine reagent.

Tollen's Test

1. Prepare Tollen's reagent by adding 5 mL of 5% silver nitrate to two test

tube.

2. Add 3 drops of 10% sodium hydroxide to each tube.

3. Mix the solution thoroughly in both tube.

Observation: formation of brown gray precipitate in each tube.

4. Add 10% ammonium hydroxide solution drop by drop to each tube,

shake after the addition of each drop until the precipitate just diss olves. Note: The Tollen's reagent has been prepared in both tubes.

5. Add 3 drops benzaldehyde to one of the test tube then shake the tube for

mixing.

6. Add 3 drops of acetone to the other test tube then shake the tube for

mixing.

7. Leave the tubes for 10 minutes.

Note: after passing 10 minutes you will observe the formation of silver mirror in the benzaldehyde tube and no reaction in acetone tub e.

Schiff's Test:

1. Prepare Schiff's reagent by mixing 1.5 mL of concentrated hydrochloric

acid to 100 mL of water in a beaker.

2. Then Add 2.8 gm of sodium bisulfite.

3. Then Add 1 gm of colored triphenylmethane dye then mix the solution.

4. Close the beaker by adding a lid to it.

5. Shake the solution until it turns yellow then to light brown color

then leave it 2 hours until it turns to be clear solution with some imp urities.

6. Add half spoon of activated charcoal to the solution then stir the

solution for 1 or 2 minutes.

7. Prepare a funnel with a filter paper then place Erlenmeyer flask un

der it.

8. Slowly pour the solution into the funnel.

9. Transfer the solution from the Erlenmeyer flask to stoppered bottle and

place label Schiff's reagent.

10. Add 2 drops of benzaldehyde to a test tube.

11. Add 2 drops of acetone to another tube.

12. Add 1 mL of Schiff's reagent to both tubes.

Observation: the formation of brilliant purple color in the benzaldehyde tube and no reaction occurs in the acetone tube.

Fehling test:

1. Prepare Fehling's reagent by mixing exactly equal volumes of Fehling's A

and Fehling's B solution in a 1:1 ratio by adding 1 mL of each solution in a test tube.

Notes:

- Fehling's A solution is an aqueous solution of copper sulfate pentahydrate (CuSO 4 .5H 2

O) with few drops of concentrated sulfuric acid.

- Fehling's B solution is an aqueous solution of potassium sodium tartrate (C 4 H 4 K NaO 6 ,4H 2

O) and sodium hydroxide.

2. Add 5 drops of benzaldehyde in a test tube.

3. Add 5 drops of acetone in another test tube.

4. Add 1 mL of Fehling reagent you just prepared to both tubes.

5. Place both tubes in water bath for five minutes at 60 ° C.

Observation: The formation of reddish brown precipitate in the benzaldehyde test tube while in acetone test tub e nothing happened (no reaction).quotesdbs_dbs5.pdfusesText_10

[PDF] [PDF] pdf Aldehyde and Ketones english