CHEMISTRY 1105Determination of Absolute

Zerousing Vernier Equipment

Absolute ZeroCONNECTIONS: Thermometer, Ruler and Capillary

Tube

CHEMISTRY 1105

Thermometer is attached to the rulerwith 2 elastics that are wrapped twice.

Then insert capillary tube between the elastics.

Align air column in tube at the base to ruler.

Absolute ZeroCONNECTIONS: Setting up the Ring Stand and

Water Bath. Build from the bottom upwards.

CHEMISTRY 1105

Absolute ZeroCONNECTIONS: Inserting Thermometer and

Ruler in the Water Bath and clamping.

CHEMISTRY 1105

• Note that the top of the Capillary Tube is at least 1 cm above the water line.

• The Ruler and Thermometer is also about 1cm above the Stir Bar to minimize interference.

Absolute ZeroCONNECTIONS & POWER:

CHEMISTRY 1105

Power Connection

Power Button

Power Connection

Power Button

Absolute Zero• Fill the beaker with tap water to about 80% and add

about 5 ice cubes.

• Make sure that the stirrer does NOT touch the ruler and thermometer when it starts stirring. Turn on the Stirplate to give even stirring.

• Read the bottom of the red oil droplet in the capillary tube.

CHEMISTRY 1105

•Tap on the Mode box to change the setting to Events with Entry. •Name the Event Column Height and enter the units as mm.

Pressure vs. VolumeCHEMISTRY 1105

Absolute Zero• Tap on the X/Y Table Icon to enter your data. Tap on Column

Height to adjust the recorded value to the correct number of significant figures. For Column Height it should read to one decimal place (eg +0.5mm). Tap on Temperature to adjust the recorded value to 2 decimal places.

• Tap on the Gauge Icon .  • Once the temperature seems to be steady between 0 to 10oC and the ice

cubes have melted, enter the accurately measured height (to +0.5mm) into the Column Height (mm) column. Now you can start the experiment by clicking on the Collect Button.

• Tap on the Keep Icon . Enter the reading into the Column

Height (mm) table.  • Record the temperature and height every 6 to 10 degrees. Turn the

hotplate on to 3 and once the temperature reaches 30oC increase the heat to 5. Stop when the temperature reaches 80oC.

CHEMISTRY 1105

Absolute Zero

• You should have at least 12 different data points after completing the experiment.

• Press the Stop Button to stop collecting data.

• Tap on the X/Y Table Icon . Record the data shown in the Run table into your lab notebook.

 • Click on Graph Icon to view the data points on a

grid. Make a rough sketch in your notebook of the graph.

 

CHEMISTRY 1105

•Shut down the Lab Quest 2.•Turn the Power Off by pressing the Power button.

• Graph your data using Excel. • Graph Column Height (mm) versus Temperature (oC).• Determine the slope and y-intercept of the line and using the equation

y=mx + b determine the value of absolute zero.

Create a graph in Excel. Go to http://kwantlen.ca/science/chemistry/chem1210/richsup/excel.pdf

Absolute ZeroCHEMISTRY 1105