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How does a burette work?

Dear student

A burettes are used in the titration experiment. They are extremely accurate.

 A simple example is the titration of an acid by a base. If you want to find out how strong an acid is, you add a couple of drops of phenolphthalein indicator to the acid of known volume and slowly add a base solution of known concentration to the stirred acid solution until it starts to turn pink. Phenolphthalein turns pink when the solution turns basic, so you just want the solution to turn a faint pink that is the base from the burette has neutralized all the acid in the solution. One can then look at how many bases were consumed by the acid. by looking at the volume of base remaining in the burette and knowing the volume of the base of a known concentration used, calculate the strength of the acid.

Regards

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Burette, also spelled Buret, laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. On a liquid burette, the stopcock is at the bottom, and the precise volume of the liquid dispensed can be determined by reading the graduations marked on the glass tube at the liquid level before and after dispensing it. In a gas burette, the stopcock is at the top; the tube of the burette is filled with a fluid, such as water, oil, or mercury, and the bottom of the tube is attached to a reservoir of the fluid. Gas is collected by displacing fluid from the burette, and the amount of gas is measured by the volume of fluid displaced.
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