Filling a burette

• Clamp a clean 50.00 mL burette (p. 10) in a laboratory stand. Place a beaker on a white tile immediately below the outlet of the burette (Fig. 21.2).
• Place a small filter funnel on top of the burette and, with the tap open, carefully pour in the standard solution (or titrant) until it starts to drain into the beaker.
• Close the burette tap, and fill the burette with the standard solution until the meniscus is about 1-2 cm above the zero mark. Remove the funnel.
• Open the tap and allow the solution to drain until the meniscus falls to the zero mark. The burette is then ready for the titration.

Note that to avoid contamination the solution in the beaker should be discarded, rather than recycled.

Fig. 21.2 Apparatus for a titration.