4: Burettes - Chemistry LibreTexts

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  1. Using A Burette

Using A Burette

Step 1

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Figure \(\PageIndex{9}\): Step 1

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

Step 2

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Figure \(\PageIndex{10}\): Step 2

Rinse the burette and glassware with the titrant a few times to prevent contamination. Attach the buret 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

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Figure \(\PageIndex{11}\): Step 3

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

Step 4

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Figure \(\PageIndex{12}\): 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

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Figure \(\PageIndex{13}\): 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.

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