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Endothermic Reaction—Freeze a Beaker to a Board

  • Page ID
    128807
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    Required Training

    Required PPE

    UC Lab Safety Fundamentals

    Lab coat, safety glasses/goggles,

    nitrile gloves

    Equipment

    Chemicals

    100 mL beaker

    17 g Ammonium Nitrate

    Wooden block

    32 g Barium Hydroxide

    Glass stir rod

    DI squirt bottle

    Procedure:

    1. Set the beaker on top of the wood block.
    2. Pour the contents of the two vials, ammonium nitrate and barium hydroxide, into the beaker simultaneously.
    3. Stir if necessary.
    4. This endothermic reaction will condense water vapor from the air between the bottom of the beaker and the wooden block and freeze it.
    5. If it is too dry, water can be sprayed on the block with a squirt bottle.

    Discussion:

    The temperature of this reaction can drop to -25C to -30C.

    Hazards:

    Spent solution should be covered and put into a fume hood as soon as possible. This reaction releases ammonia gas. Soluble barium compounds are toxic to blood. Consult MSDS for full detail.

    SOP:

    Nitrates – Ammonium Nitrate

    Disposal (by Storeroom)

    Cover the beaker with parafilm after the demo and put the entire set-up into a large beaker during transit to prevent spilling. Return this Barium solution for proper disposal.


    Endothermic Reaction—Freeze a Beaker to a Board is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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