How to use a glass pipette and Biurette?

Hiya, I was just if anyone can provide me with some more informations on these equipments for e.g: how to use them and what is their functions.

a) the glass pipette b) the Biurette

Any help would be appreciated,

thanks

Reply 1

x kat x

i know the burette is a more accurate way of measuring and it's useful for finding out how much carbon dioxide is made with the yeast experiment.

Reply 2

oxymoron

They are used in titrations. So the pipette can measure out an accurate aliquot (ie a set volume eg 25cm3). It is used by sucking up the liquid through the pipette (using a pipette filler) until the liquid reaches the mark (which is a line drawn on the glass). At this point, the pipette holds the exact aliquot required and it can be emptied into a conical flask (or whatever!)

A burette can be used to measure the titre needed to reach the endpoint. So it is filled with a liquid and an initial reading is taken (the burette is graduated all the way from the top to the bottom and can be read to +/-0.05cm3). The experiment is then run with liquid being run out of the burette slowly using the tap at the bottom. At the endpoint the final reading is taken and the difference between the two readings is the volume that was required.