Question

List the errors associated with uncalibrated instruments (10 mL and 25 mL Class A pipets, 50 mL Class A buret) & the expected errors associated with calibrated instruments.

Answer 1

Uncalibrated instruments has errors such as Uncertainty in volume of the pipetted solution or solution added by burette. This can is called systematic errors and this carry on with every other experiment that has been carried on, this can be corrected by calibrating the instrument.

Expected errors of calibrated instruments.

The expected errors of the pipette are the parallax error or other errors such as not pre rinsing the pipette, blowing the last drop in the pipette and some errors due to temperature fluctuations and other due improper pipetting techniques.

In case of burette, the above mentioned errors can be seen and other error such as not filling the tip of the burette and not closing the burette properly can also account to some error.