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4: Burettes

  • Page ID
    361503
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    Using A Burette

     

    Step 1

    image003.gif
    Figure \(\PageIndex{1}\): Step 1

    A vertical stopcock means the buret is open and a horizontal stopcock means the burette is closed. A helpful tip: the direction of the stopcock follows the direction of the flow.


    Step 2

     

    image005.jpg

    Figure \(\PageIndex{2}\): Step 2

    Rinse the burette and glassware with the titrant a few times to prevent contamination.  Attach the burette to the stand. Close the stopcock at the bottom of the buret and pour the titrant through a funnel at the mouth of the burette.  Slightly lift the funnel to prevent the liquid from overflowing.

    Step 3 

    image007.gif
    Figure \(\PageIndex{3}\): Step 3

    If any air bubble appears, open the stopcock, and tap the side of the burette until the bubble disappears.

     

    Step 4

    image009.gif
    Figure \(\PageIndex{4}\): Step 4

    Note that the burette reads in ascending order with the 0.00 mark at the top. You must be at eye level with the bottom of the meniscus (curved surface of liquid) to read the burette. Reading from above or below the meniscus will result in a parallax error.  In order to better read the meniscus, keep a dark piece of paper behind the buret.

     

    Step 5

    image011.jpg
    Figure \(\PageIndex{5}\): Step 5

    During a Titration, keep the liquid flowing normally until a few mL from the endpoint (the point at which the color changes).  Around the endpoint, allow the liquid to flow drop-by-drop.  After reaching the endpoint, rinse and dry the tip of the burette.


    This page titled 4: Burettes is shared under a not declared license and was authored, remixed, and/or curated by Robert Belford.

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