CHM 101/102
Gas Laws
General Chemistry 101/102
Laboratory Manual
University of North Carolina at Wilmington
Laboratory Manual
CHM 101/102
Gas Laws
•
Purpose
 To study the relationships that exist among the
properties of temperature, pressure, and volume
for gases.
 To learn methods for measuring the temperature,
pressure, and volume of gases.
•
Safety Considerations
 There are no special safety considerations
associated with this activity.
 There are no chemical wastes generated by this
activity.
Laboratory Manual
CHM 101/102
Gas Laws
•
Part 1: Boyle’s Law

Open the Applications
folder on your computer
and double click on the
“Microlab” Prompt as
shown in the photo.
Laboratory Manual
CHM 101/102
Gas Laws
•
Part 1: Boyle’s Law

Click on the “Gas
Laws” prompt and
then double click on
the “Boyles Law”
program to open up
the file for the first
part of the
experiment.
Laboratory Manual
CHM 101/102
Gas Laws
•
Procedure: Part 1: Boyle’s Law
 Obtain the plastic tubing
and two syringes located in
the ziplock bag labeled
“Gas Laws Experiment”,
located in the plastic
container for Microlab
Equipment.
 Disconnect the plastic
tubing from the syringe.
Connect the fitting of the
tubing to the port labeled
“Pressure” on the back of
the Microlab kit as shown
in the picture to the right.
Laboratory Manual
CHM 101/102
Gas Laws
•
Procedure: Part 1: Boyle’s Law
 Obtain a syringe
with a plunger and
open the plunger
up to the 10 mL
mark.
 Now, re-connect
the other end of
the plastic tubing
to the top of the
syringe.
Laboratory Manual
CHM 101/102
Gas Laws
 Begin data collection by
clicking the “Start”
prompt.
 While holding the
plunger of the syringe
steady at 10 mL, type in
the value “10” in the
keyboard input box.
 Click on “Enter and
Continue” for the volume
and pressure data to be
collected.
Laboratory Manual
CHM 101/102
Gas Laws
 Move the plunger to the 9 mL
mark and type in this value in
the input box, then press
“Enter and Continue”.
 Set the plunger to
subsequent volume settings
(ex. 8, 7, 6, 5 and then up to
6, 7, 8, 9, 10, 11, 12 and 13
mL).
 Press “Enter and Continue”
while holding the plunger at
each volume setting.
Laboratory Manual
CHM 101/102
Gas Laws
 After you have
completed your
measurements,
press the “Stop”
prompt.
 Volume and
pressure data will
be available in the
table below the
graph, as in the
photo shown.
Laboratory Manual
CHM 101/102
Gas Laws
 Your graph will
look similar to the
one on the photo,
where the red line
indicates pressure
on the y-axis (in
units of torr)
versus volume on
the x-axis (in mL).
 (Ignore the blue
line.)
Laboratory Manual
CHM 101/102
Gas Laws
• Procedure: Part 2: Pressure vs Temperature
 Before beginning
Part 2 of the
experiment you
will be asked if
you would like to
save the data
from Part 1.
Always click
“NO”.
Laboratory Manual
CHM 101/102
Gas Laws
Part 2: Pressure versus Temperature
 To begin the second
experiment open the
Applications and
Microlab folders.
 Click on “Gas Laws”
and then double click
on the experiment
labeled “Pressure vs.
Temperature
Relationship-CHM
102”.
Laboratory Manual
CHM 101/102
Gas Laws
 Connect the temperature
sensor to the
temperature port A in
front of the Microlab Kit.
 Remove the syringe with
the plunger and attach
the syringe containing
the black stopper to the
plastic tubing.
 Remove the rubber stopper from the syringe and
then push it back in making sure it fits tightly.
 Use a rubber band to attach the temperature sensor
to the syringe as shown in the photo.
Laboratory Manual
CHM 101/102
Gas Laws
•
Procedure: Part 2
 Place the syringe in
each water bath,
starting with ice water,
for two minutes.
 Record both the
temperature and
pressure readings
observed for each
water bath.
Laboratory Manual
ice
water
room
temp
hot
water
CHM 101/102
Gas Laws
•
Procedure: Part 2
 Click “Continue”
when the syringe
and temperature
probe are
immersed in the
water bath.
Laboratory Manual
CHM 101/102
Gas Laws
•
Procedure: Part 2
 Pressure and temperature
values will be collected for
each water bath.
 You may wish to collect
data for combinations of
water bath temperatures
by adding some ice to the
tap water, or to the hot
water. This will give you
more than just 3 data
points for your
experiment.
Laboratory Manual
CHM 101/102
Gas Laws
•
Procedure: Part 2
 When you have
finished data
collection click the
“Stop” prompt.
 A graph of
pressure on the yaxis (in torr) versus
temperature on the
x-axis (in Celsius)
will be drawn for
you, similar to the
one in the photo.
Laboratory Manual