In order to make sure it is clean and prepared for calibration, fill your volumetric glassware with deionized water and let it drain completely. If the water is clean, it should run off the inner walls without beading. If the buret or pipet needs to be cleaned, ask your lab instructor how to clean them. You may also get some cleaning solution to clean the buret.
Follow the below steps to calibrate the Burette When it is ready:
- Take a clean conical flask of 100cm3 fitted with a cork. Measure the mass of the flask accurately and record it to the nearest milligram on the analytical balance Mass. Clean the burette thoroughly and grease the stopcock properly.
- Fill up the burette with distilled water and note the room temperature. Make sure that the water level must be leveled to the zero mark. Touch the burette tip to the wall of the beaker to remove the adhering liquid drop. Take the initial reading of the water level in the burette.
- Pour 10 cm2 of distilled water into the conical flask. Touch the tip of the burette to the wall of the flask. Cork the flask and weigh it accurately on an analytical balance and record the mass.
- The difference between this mass and the initial mass of the flask gives the mass of the water dispensed. calculate the amount of Water is actually dispensed by dividing the mass by the density of the water.
- Repeat the same process with 20 cm3, 30 cm3, 40 cm3 and 50 cm3 water, thus calibrating the burette over its entire length.