How to Calibrate Volumetric Apparatus

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:

Volumetric flask:

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

                              ———————– 

                                        TV   

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.

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One Response to “How to Calibrate Volumetric Apparatus”
  1. THANDO Says...

    On September 17, 2010 at 4:29 am

    this is good stuff keep it ip and please send me any articles of scientific interest


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