Question

State the function of: The tap at the base of a burette.

Answer 1

Burette is a graduated cylindrical glass tube used often in volumetric titrations in analytical chemistry. We can measure the amount of liquid drawn from the burette by the scale on its surface.

Complete answer:
We will get some information about burette.
- Burette is a graduated cylindrical glass tube. It has a tap at one of its ends. Burettes are often used in volumetric titrations. So, it is useful in analytical chemistry.
- We know that burette is used to take the solutions in specific volumes. We can take solutions drop by drop in a way that we can take the required amount of solution. Tap allows the liquid to pass through. So, it is useful to deliver the required amount of liquids.
- Burette has graduated marks on its glass surface from which we can measure the volume of the solution. Majority of burettes are made up of glass but some burettes are made up of plastic also. The function of the stopcock is to control the flow of the liquid present in the burette.
- Depending upon the accuracy of the volume of the burettes, they are divided into classes like A, B and C. Out of them, class Aare of highest quality.
Thus, we can conclude that the tap at the base of the burette has the function of controlling the flow of liquid.

Note:
Do not get confused between burette and pipette. Burette has a stopcock or tap at its one end. While in case of pipette, it does not have any stopcock at its ends. So, in titration, the titrant liquid is filled in burette only.