Question

For what purpose burette are used for? What is the value of 10x if the least count of burette used normally is x (in mL)?

Answer 1

Hint: “The least count in the burette is defined as the smallest unit that is marked on the burette equipment. The common word used for this purpose is called Least Count”.

Complete step-by-step answer:A burette is a graduated glass tube with a tap at one end, for delivering known volumes of a liquid, especially in titrations. It is a long, graduated glass tube, with a stopcock at its lower end and a tapered capillary tube at the stopcock's outlet. Burettes are used for measuring volume mainly in titrations.
-All instruments like thermometer, burette and so on, have divisions.
-This division tells us how much value can be read by using that particular instrument.
-The least count is defined as the smallest unit that is marked on the given equipment.
-Least count can be described as the smallest value that can be measured by an instrument.
-In the question it is given that the least count of burette is x and we have to find the value of 10x.
-Generally the least count of burette is 0.10 cubic centimeter or ml.
Means x = 0.10 cubic centimeter ($c{{m}^{3}}$).
We have to calculate 10x.
\[\begin{align}
  & \text{ }x=0.1c{{m}^{3}} \\
 & 10x=10\times 0.1 \\
 & \text{ = 1} \\
\end{align}\]
Therefore the value of 10x is 1.

So, the correct option is A.

Note: Don’t be confused with the terms centimeter cube ($c{{m}^{3}}$) and milliliter (mL). Both are the same.
A cubic centimeters ($c{{m}^{3}}$) is a measure of volume that is equal to a cube with width, length and height are all 1 centimeter.
1 $c{{m}^{3}}$ is a thousandth of a liter.
So, a Milliliter (mL) as per its name, is also a thousandth of a liter.
Therefore 1 $c{{m}^{3}}$= 1mL.