General Chemistry I (Laboratory)
Summer 2021
Experiment 1: The Use of Volumetric Glassware
NOTE: Type your answers on the sheet and turn in the competed sheet into. You must show work, whenever necessary, to earn points. Use the Equation Editor to show your work.
PART 1 – Percentage error of a graduated cylinder
Volume dispensed from the graduated cylinder =
Weight of the beaker =
Weight of the beaker + water =
Weight of water =
Density of the water =
True volume (from the calculation) =
Show work below:
=
Percentage error (show work below) =
PART 2 – Percentage error of a pipette
Volume dispensed from the pipette =
Weight of the beaker =
Weight of the beaker + water =
Weight of water =
Density of the water =
True volume (from the calculation) =
Show work below:
=
Percentage error (show work below) =
PART 3 – Percentage error of a burette
Volume dispensed from the burette =
Weight of the beaker =
Weight of the beaker + water =
Weight of water =
Density of the water =
True volume (from the calculation) =
Show work below:
=
Percentage error (show work below) =
Post-lab questions
From the glassware that you used in the experiment, which one has the lowest percent error?
If you want to measure 16.00 mL of a solution, accurately, which glassware would you choose?
In this experiment, we did not use the average values for the mass or the volume of water that was dispensed from the glassware. However, in real experiments, average values are used. Why do we usually use the average values instead of a single value?
How would you calculate the precision of the glassware used in the experiment?
