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    Aldehyde and Ketone Lab Report 3, Chem II

    Uploaded by

    Hema Jothy
    This document outlines procedures to qualitatively identify carbonyl compounds as either aldehydes or ketones using various chemical tests. The tests include Fehling's solution, Tollens' reagent, Schiff's reagent, and iodoform test. Ethanal, benzaldehyde, and propanone are used as known aldehyde and ketone samples. Fehling's test and Tollens' test identify aldehydes by observing precipitate formation. Schiff's test identifies aldehydes except benzaldehyde by a color change, and identifies propanone. The iodoform test identifies ethanal by precipitate formation upon warming. Through these tests, the functional group of an unknown carbonyl compound is determined.

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    Aldehyde and Ketone Lab Report 3, Chem II

    Uploaded by

    Hema Jothy
    572 views3 pages
    This document outlines procedures to qualitatively identify carbonyl compounds as either aldehydes or ketones using various chemical tests. The tests include Fehling's solution, Tollens' reagent, Schiff's reagent, and iodoform test. Ethanal, benzaldehyde, and propanone are used as known aldehyde and ketone samples. Fehling's test and Tollens' test identify aldehydes by observing precipitate formation. Schiff's test identifies aldehydes except benzaldehyde by a color change, and identifies propanone. The iodoform test identifies ethanal by precipitate formation upon warming. Through these tests, the functional group of an unknown carbonyl compound is determined.

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    Aldehyde and Ketone Lab Report 3 , Chem II

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    This document outlines procedures to qualitatively identify carbonyl compounds as either aldehydes or ketones using various chemical tests. The tests include Fehling's solution, Tollens' reagent, Schiff's reagent, and iodoform test. Ethanal, benzaldehyde, and propanone are used as known aldehyde and ketone samples. Fehling's test and Tollens' test identify aldehydes by observing precipitate formation. Schiff's test identifies aldehydes except benzaldehyde by a color change, and identifies propanone. The iodoform test identifies ethanal by precipitate formation upon warming. Through these tests, the functional group of an unknown carbonyl compound is determined.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    572 views3 pages

    Aldehyde and Ketone Lab Report 3, Chem II

    Uploaded by

    Hema Jothy
    This document outlines procedures to qualitatively identify carbonyl compounds as either aldehydes or ketones using various chemical tests. The tests include Fehling's solution, Tollens' reagent, Schiff's reagent, and iodoform test. Ethanal, benzaldehyde, and propanone are used as known aldehyde and ketone samples. Fehling's test and Tollens' test identify aldehydes by observing precipitate formation. Schiff's test identifies aldehydes except benzaldehyde by a color change, and identifies propanone. The iodoform test identifies ethanal by precipitate formation upon warming. Through these tests, the functional group of an unknown carbonyl compound is determined.

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    © All Rights Reserved
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    of 3

    ALDEHYDE AND KETONE

    OBJECTIVE
    To identify carbonyl compounds as aldehyde and ketone using qualitative analysis

    APPARATUS
    Stopper, test tubes, water bath, thermometer

    CHEMICAL REAGENTS
    Iodine solution or potassium iodide, Tollens reagent, Schiff reagent, Fehlings solution,
    NaOH 10% solution, Dioxane or its equivalent, 2,4-Dinitrophenylhydrazine, ethanal,
    benzaldehyde, propanone, an unknown carbonyl compound (X compound), ammonia 5%
    solution.

    METHOD
    A.

    Fehlings Test
    1. 2 ml of Fehlings solution was placed in each test tube. 1-2 drops of the
    compound was added to be tested.
    2. Tubes were shaked gently.
    3. The mixture was heated in boiling water for 15-20 minutes and was determined
    whether any precipitate has been formed.

    B.

    Tollens Test
    1. 1 ml Tollens reagent was added to each test tube contains the compound to be
    tested and tubes were shaked gently
    2. The mixtures allowed to stand for 3 minutes and then the formation of any silver
    formation was noted.
    3. When there is no change, the mixture was warmed in a water bath at 65C-75C
    for 3 minutes.
    4. Observation was recorded.

    C.

    Schiffs Test
    1. One drop of ethanal, benzaldehyde, propanone and an unknown carbonyl
    compound was placed into 4 different test tubes respectively.
    2. 1 ml of Schiffs reagent was added into each of test tube.
    3. They were shaked slowly and noted whether there is any change in color.
    4. When the compounds do not dissolve, the test tube was stopper and was shaked
    vigorously until an emulsion is formed.
    5. Observation was recorded.

    D.

    Iodoform Test
    1. 5 drops of ethanal, benzaldehyde, propanone and an unknown compound was
    placed into 4 different test tubes respectively.
    2. 5 ml dioxane was added in each tube and shake to dissolve the compounds.
    3. 1 ml 10% NaOH solution was added.
    4. While shaking, iodine or potassium iodide solution was added one drop at a time
    until the iodine color is retained.
    5. The test tube was warmed in a water bath at 65C-75C for a minute. When
    iodine color disappears, more iodine or potassium iodide solution was added. The
    formation of precipitate was noted. Observation was recorded. The functional
    group of the unknown carbonyl was suggested .

    CONCLUSION
    Hypothesis accepted. Fehlings n Tollens is used to test for aldehyde. Schiffs test used to
    test aldehyde except benzenealdehyde and it will be negative result for ketone except
    propanone. Iodoform test is used to test ethanal.

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