PSL Calorimetry Lab
#1 Water Mixtures
Enter your class period (1-8)
time, you need to minimize (NOT close) your browser window. Next go to Start, Programs,
Personal Science Laboratory and PSL Excelerator. When Excelerator opens, click on the
thermometer icon. To calibrate a thermometer, enter the number taped to the probe's wire
and choose extended. Answer okay to location to the right of $C:$C. Click on the
experiment clock and set the duration to 10 minutes (not seconds). When you are ready to
measure and record the water temperatures, press the G for GO button.
are ready to mix the two water sample together, carefully pour the COLD water into the HOT
water. Note that no water should overflow from the HOT water cup since both cup samples
were initially LESS than ½ full. Use the temperature probe to gently stir the mixture -
record the final equilibrium temperature. Do NOT slosh any water out of the HOT cup.
Sheatgained + Sheatlost = 0
to solve for the
theoretical final temperature of the water mixture. Be sure to first write your variable
expression with m's, c's, Tf's and To's before you substitute in
your experimental values to solve for Tf.
Determine the accuracy of your experiment by calculating your data's percent error.
% error = | Experimental - Theoretical
| * 100
Discuss what your group
feels is this lab's (a) greatest source of error and (b) a valid procedure that could
minimize the error's negative consequences when the lab is completed next year.
When you are finished with
the experiment, close PSL Excelerator (File, Exit - do NOT save changes or any data), dry
off the probe, empty your water samples into the front sink and turn your empty cups
upside down on a paper towel to dry out for next period.