How to use burettes

Burettes are used for titration and are calibrated « to deliver ». First rinse the burette very well with solution you will use for titration. Then fill the burette a bit higher than the zero mark. To activate the stopcock drain the solution but never below the capacity of zero mark. Pay attention that there will be no air bubbles left inside the burette. Fill more titration solution up to max 10mm above the zero mark and pay attention not to wet the burette wall above the liquid level. By reading the meniscus at your eye level drain the solution to the exact level of the zero. At this step you have to wipe the drops at the tip of the burette tip. Then you have to open the stopcock very slowly and start the titration and also pay attention not to touch the tip to the wall of the container you use. When the colour changes stop the titration process and wait for 30 seconds for the waiting time. You have to read the discharged volume at your eye level. Do not forget to wipe the remaining drop of liquid at the burette tip since this is also a part of the titrated volume.