Volumetric apparatus can be calibrated manually. This is a simple procedure on how you can do it.
To ensure proper measurement of volumes in the laboratory, volumetric apparatus should be calibrated regularly. Two of the most common apparatus calibrated are volumetric flasks and serological pipettes.
This is a simple, manual procedure on how to calibrate volumetric apparatus:
1. Weigh the volumetric flask.
2. Fill the volumetric flask with distilled water, up to the mark
3. Weigh the volume of distilled water contained in the flask.
4. Calculate the experimental volume of glassware by the formula:
Weight of dist. H2O
Experimental volume of glassware = ——————–
(EV) Density of H2O AST
(Constant value =1)
5. Calculate the percent error.
% Error = (TV) – EV X 100
Where: TV= Theoretical Volume
EV = Experimental Volume
6. Record data.
7. Do the same procedure with the serological pipette.
8. Record again your data.
9. Allowable percent error is +- 0.03 %.
Image via Wikipedia
10. If the error is more than this, then the apparatus should be discarded or changed into a volumetric apparatus that could measure more accurately.