Make sure the stopcock is closed. Put a waste beaker under the tip of the buret just in case! Rinse the buret by adding a small amount of solution, remove the buret from the ring stand and rotate and tip it to wet the interior completely. Put the buret back in the ring stand and empty it into the waste beaker.
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Unlike the precise volumetric pipets (which only deliver one volume), burets can add any volume between zero and 50 mL. When you need one for an experiment, they will be available from the stockroom. Before you use it, be sure it is thoroughly clean, drains freely, and does not leak around the stopcock.
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The pipette refered to in the preveious answers if more correctly called a volumetric pipette. There are pipettes (say a 10 mL pipette) which have gradations and can be used to deliver different amounts, like 3.5 mL. The most accurate would be the volumetric pipette, mainly because it is a specialized instrument designed to deliver one particular volume.
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They are useful for measuring any volume of liquid. Plastic Pipets: Pipets come in two general types. Plastic pipets are used to quickly measure a volume of liquid when. accuracy and precision do not matter. It is often assumed that 1 drop from a pipet is equal to 0.05 mL, thus there are 20. drops/mL. Volumetric Pipets: Glass pipets are commonly called volumetric pipets because they are a simple, yet very accurate. way to measure volume.
http://www.chemhaven.org/che101/lab/Lab_1_Volume_F11.pdf
Best Answer: the burette is more accurate than the pipette. that is b'coz the burette is so graduated so as to read the volume of the liquid contained from 0 to 50 or 100 ml from the top to the other end. whereas the pipette deliveres the fixed volume of liquid eteched on it.
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Volumetric pipets are so accurate because the long neck decreases the error in measuring volume of. the meniscus. They are only designed to measure one speci c volume and commonly come in sizes 5 mL, 10 mL, 25 mL, and. 50 mL. The accuracy of a volumetric pipets is commonly taken to be 0.01 mL.
http://www.chemhaven.org/che101/lab/Lab_1_Volume_F11.pdf
So, assuming your buret is standard and measures in tenth of a mL incriments, you will measure your volume to the hundreths place. Volumetric pipettes should say exactly how much they hold, like 10.00mL or 25.00mL, etc. If they only say 10mL or 25mL, then you have to use that. Morris pipettes are like a graduated cylinder with a bulb - so you would read that just as you read your buret. All this fuss over something seemingly so simple is done for a reason.
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Make sure the flask is clean and thoroughly rinsed with a small volume to the liquid in use. See the section on cleaning glassware. Using a funnel or pipet, fill the flask to just below the etched line with liquid. Do not wet the ground glass joint at the top of the neck with the liquid.
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The graduated pipet is similar to the buret except that it is hand-held and is filled by putting a rubber suction bulb over the end, drawing the liquid up past the last calibration mark, then quickly placing the end of your finger over the end of the pipet to hold the vacuum.
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Place the pipet or suction bulb over the top of the pipet. 2. Evacuate air from the suction bulb by squeezing open the top valve (Labeled A) and gently. squeezing air out of the bulb. When the bulb is empty release the top valve.
http://www.chemhaven.org/che101/lab/Lab_1_Volume_F11.pdf
how precise is a pipet
Volumetric pipets are so accurate because the long neck decreases the error in measuring volume of.