LABORATORY TECHNIQUES REPORT SHEET
Name: ________________________________________ Date: _____________
Teaching Assistant: ___________________________________________________
A. The Thermometer and Its Calibration
Temperature of water and ice mixture
_______________°C
Temperature of boiling water
_______________°C
Atmospheric pressure
_______________ mm Hg
True (corrected) temperature of boiling water
_______________°C
Percent relative error of thermometer
_______________ %
(Show calculation and include calibration curve)

Use the true temperature of boiling water above as the literature value
B. Using the Balance to Calibrate Your 10 mL Pipette
Temperature of water used in pipette
____________ °C
Corrected temperature (from your calibration curve)
____________ °C
Trial 1
Trial 2
Trial 3
Mass of Erlenmeyer plus water
Mass of Erlenmeyer
Mass of water
Volume delivered by pipette
(Show calculations)
Mean volume delivered by 10 mL pipette
_____________ mL
(Show calculation)
Trial 1
Trial 2
Trial 3
Individual deviations from the mean
Average deviation from the mean
mL
(Show calculation)
Volume delivered by your 10 mL pipette
__________ mL ± ___________ mL
NOTE: PLEASE SHOW ALL CALCULATIONS ON A SEPARATE SHEET OF PAPER.
C. Determination of Density
Object
Mass (g)
Volume (mL)
Density (g/mL)
(Show Calculations)
Water
Ethanol
Tall Shiny
Metal
Short
Golden Metal
Short Dull
Metal
Rectangular
Metal
QUESTIONS - Answer the following question on a separate sheet of paper. Show all
calculations.
1.
2.
3.
4.
5.
6.
7.
Using table 1.3 create a graph relating temperature to density of water. (see Appendix A
for proper graphing techniques).
Determine the density of water at 32°C using your graph.
The relationship between temperature and density is linear for the region above 4°C up to
close to the boiling point=. Consult Appendix A regarding linear relationships and using
the method of least squares determine the equation that relates degrees temperature to
density. Make sure to show all your work.
Calculate the density of 32°C using this relationship.
Calculate % relative error for density of water.
Compare the volume of the metal cylinders obtained by the Archimedes’ method to that
obtained from the calculation based upon dimensions
Being mindful of propagation of error, to what certainty is your calculated volume for the
rectangular metal object? (i.e. what is the ± in cm3?)
Laboratory Techniques Mark Sheet
Part A: Thermometer Calibration
Name: __________________
Your Mark
Out of
Corrected boiling temperature
1
Percent relative error of thermometer
1
Calibration curve
2
Part B: Pipette Calibration
Your Mark
Out of
Using corrected temp from curve
1
Correct calculations
1
Determining mean volume
1
Average Deviation
1
Part C: Densities
Your Mark
Out of
Water
2
Ethanol
2
Tall Shiny
2
Short Golden
2
Short Dull
2
Rectangular
2
Calculations
1
Questions:
Your Mark
Out of
1. Graph
2
2. Density from the graph
1
3. Equation of line
2
4. Calculated density
1
5. Percent relative error
1
6. Comparison of the volume in the two methods
1
7. Propagation of error in calculated volumes
1
Your Mark
Out of
30
15