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    Experiment No. 6 - Saponification 1

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    maicadicion
    EXPERIMENT 6.

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    Experiment No. 6 - Saponification 1

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    maicadicion
    17 views2 pages
    EXPERIMENT 6.

    Original Title

    Experiment-No.-6_Saponification-1

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    EXPERIMENT 6.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    17 views2 pages

    Experiment No. 6 - Saponification 1

    Uploaded by

    maicadicion
    EXPERIMENT 6.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    PRE-LABORATORY EXPERIMENT No.

    6
    SAPONIFICATION

    Safety: Be sure to exercise caution when dispensing the 9 M NaOH. If the chemical comes into
    contact with your skin, immediately rinse with water for a minimum of fifteen minutes and notify
    your instructor.
    Personal Protective Equipment (PPE) required: safety goggles, lab coat or gown, and closed-
    toe shoes.
    Materials and Equipment: Warm olive oil (preheated), 9 M sodium hydroxide solution, food
    coloring, assorted fragrances, stearic acid, 250 ml beaker, plastic stirring rod, glass pipets, and
    pipet bulbs.
    Procedure:
    1. Preheat olive oil to 35OC. Pour 10 ml of preheated olive oil into a 250 ml beaker.
    2. Before beginning the reaction, choose your fragrance.
    3. Add 1-2 drops of desired fragrance. Do not mix fragrances.
    4. Add 3 ml of 9 M sodium hydroxide solution to the beaker. This is approximately two full
    dropper squirts.
    5. Use the plastic stirring rod to mix. You must stir for 20-45 minutes. You may choose to
    take turns with your lab partner. The mixture will slowly become smoother and more
    opaque; it should thicken to a pudding-like consistency.
    6. After approval by the instructor, add 2-3 drops of desired food coloring and stir.
    7. Add a dash (approximately 1/8 teaspoon) of stearic acid. This will serve as a hardener for
    the liquid soap. Stir.
    8. Pour into chosen mold shape.
    9. After pouring into the mold, the process will continue on its own. The soap will heat up
    and liquify again, then cool off slowly, harden, and dry. So, the soap must be left
    undisturbed for at least 12 hours.
    Experimental Observations.
    You may make observations after the soap has dried.
    1. Does it smell like any soap that you have used?
    2. Wash your hands with your soap. Does it lather like regular soap?
    3. Does it clean your hands as well as regular soap? Explain.
    4. Just in case your soap contains any unreacted sodium hydroxide, rinse your hands
    thoroughly.
    Questions to Answer:
    1. The saponification reaction occurs between an acid and a base, as shown in the procedure.
    In the reaction you performed, what is the acid and what is the base?
    2. The base used in the saponification reaction must always contain a hydroxide ion. What
    bases are most commonly used for this reaction?
    3. The products of the reaction are glycerol and crude soap. The chemical formula of the soap
    is CH3(CH2)14COO-Na+CH3(CH2)14COO-Na+. Draw the line-angle structure.
    4. One of the above structure, circle the portion of the molecule that is water soluble. Why is
    the portion of the water-soluble?
    5. On the above structure, box the portion of the molecule that is fat soluble. Why is this
    portion fat soluble?
    6. On the above structure, add interactions to water molecules: positive ion to hydrogen dipole
    and negative ion to negative dipole.
    7. During the lab session, why did the saponification reaction require a long period of stirring?
    8. After the lab session, why did the soap have to “cure” in the molds?
    9. Do you think that the type of fat used will make a difference in the product/ why or why
    not?

    Note: All questions to answer must be written after the post-laboratory activity.

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