Why is it important for the buret to be clean before using? how do you clean a buret

Sometimes, the types of the contaminents might have a slight or major effect on the concentration of your tirant and the reaction that takes place in your sample or multiple samples. The second and somewhat more important reason for cleaning your burette has to do with water. When you're cleaning your glassware, it is recommended to use water to rinse it off.

Less stable  hope this

The total number of electrons is 14