When filling a burette for a titration:
a adjust the burette so that the opening is near or below the eye level preferably over a sink.
b. Then, use a funnel to add the titrant into the burette.
c. The titrant should be filled almost to the zero mark.
The process of filling a burette ensure the accuracy and reliability of titration experiments. Positioning the burette at or slightly below eye level allows for better visibility of the meniscus which is the curved surface of the liquid within the burette.
This is essential for measuring the volume of titrant dispensed during the titration. Using a funnel not only makes it easier to pour the titrant into the burette but also reduces the risk of spills or splashes that can affect the accuracy of the titration.
Filling the burette almost to the zero mark provides a precise starting point for the titration and allows for more accurate volume measurements during the titration process which is essential for calculating the concentration of the substance being titrated.