Laboratory Techniques Report Sheets 2016 PDF

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Summary

notes for CHY 113...

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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)

(Archimedes’ Method)

(Show Calculations)

Water

Ethanol Tall Shiny Metal Short Golden Metal Short Dull Metal QUESTIONS - Answer the following question on a separate sheet of paper. Show all calculations.

1.

Using the defined freezing and boiling points of water, make a graph (see Appendix A for proper graphing techniques) of degrees Fahrenheit versus degrees Celsius on graph paper.

2.

Determine the Celsius equivalent of 88°F using your graph.

3.

The relationship between these two temperature scales is linear. Consult Appendix A regarding linear relationships and using the method of least squares determine the equation that relates degrees Fahrenheit to degrees Celsius. Make sure to show all your work.

4.

Compute the Celsius equivalent of 88°F using this relationship.

5.

Calculate % relative error for density of water and ethanol.

6.

Compare the volumes of the metal cylinders determined by the Archimedes’ method with the calculated volume based upon length and diameter.

7.

Being mindful of propagation of error, to what certainty are your calculated volumes (i.e. what is the ± in cm3?)...