Question

How much volume of water has been dispensed if the initial burette reading was 0.73 ml and the final is 25.98 ml?

Answer 1

To determine the water dispensed, we need to know what a burette is. A burette is a chemical apparatus used in a laboratory to disperse a liquid and measure the volume dispensed. They can be used during quantitative chemical analysis, titrations, etc.

Complete answer: A burette is usually made of either glass or plastic. It has a long and narrow tubular shape. It has various marks known as a graduation scale which is used to note down readings. At the end of the tube, there is a valve to control the flow of dispersion of the liquid. A burette is usually accompanied by a burette stand.
There are various precautions that need to be taken while taking a burette reading so we can accurately measure the amount of solution dispersed.
- There should be no bubbles in the liquid.
- The burette should be observed at an eye level.
Now, before starting the procedure, one must note the reading of the burette. This reading is known as the initial burette reading. The reading noted at the end of the procedure is known as the final burette reading.
The volume of liquid dispersed can be calculated by subtracting the initial burette reading from the final burette reading.
Volume of water dispersed = Final burette reading - Initial burette reading
Now it is given to us that,
Initial burette reading - 0.73 mL
Final burette reading - 25.98 mL
So, the volume of water dispersed would be
Volume of water dispersed = 25.98 - 0.73 mL
Volume of water dispersed = 25.25 mL
So, 25.25 ml of water has been dispensed if the initial burette reading was 0.73 ml and the final is 25.98 ml.

Note: It is very important to note that when noting down a value from the burette, the lower meniscus of the liquid is used to take a reading when the sample is colorless or lightly colored whereas the upper meniscus is used to take a reading when the sample is dark colored and the lower meniscus is not visible.