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What is a burette?

A burette is a long graduated cylindrical glass tube with a stop cock and narrow tip at the end.

A burette is usually filled with an acid or a base and is used to deliver a precise quantity of liquid into a conical flask during a titration. The quantity of liquid that is delivered is called a titre. Burettes commonly come in 25 mL, 50mL and 100mL sizes.

Titration is the process of determing the concentration of a liquid, usually an acid or a base, using specialised volumetric glassware.

conical flask is filled with a precise quantity of liquid from a bulb pipette which will react with the contents of the burette.

A chemical indicator is selected and added to the flask to determine the end point of the titration. Examples of inidcators are phenolphthalein, methyl orange and bromothymol blue.

At the end point of an acid base reaction neutralisation occurs and the number of moles of hydrogen ions is equal to the number of moles of hydroxide ions.

n(H+) = n(OH-)

moles of acid = moles of base