The Heat of Reaction experiment will also be carried out using a
temperature probe connected to a computer. The data collection will be carried out
using the calorimetry experiment in LoggerPro®.
The experiment will involve one of the following reactions....
HCl + NaOH -------> NaCl + H2O
HOAc + NaOH -------> NaOAc + H2O
Use this equation to determine the limiting reagent.
|The computer program, , will assign you
volumes of NaOH, HCl
or HOAc and water to use.
HOAc is acetic acid, HC2H3O2.
Using a 10 mL graduated cylinder, add to your calorimeter, the assigned volume of NaOH and wash it in with the assigned volume of water. Add a magnetic stirring bar.
Add the assigned amount of ACID to your graduated cylinder. Go to a computer and insert the temperature probe
Start the Calorimetry experiment in DATALOGGER.
The first 20 sec are used to establish the initial temperature. Then add the ACID from the graduated cylinder. There will be a sudden change in temperature which will stabilize at a new level. The experiment stops automatically at 120 sec.
Analyze the DATA to establish the initial and final temperatures.
Identify with a title and personalize with your name the graph. Print out a copy for your report.
MOLAR HEAT of
REACTION is defined as...... kilojoules of energy
absorbed when one mole of reactant reacts.
The following Assumptions are made to simplify the calculations:
(Volume in mL)(Molarity) = millimoles
VolumeHCl + VolumeNaOH+ Volumewater = Volumeliquids
Temperaturefinal-Temperatureinitial = Temp. Changeliquids
(Massliquids)(-Temp. Changeliquids)(4.18 j/gºC) = Energy Change
Energy Change/[(1000 j/Kj)(Moles of Limiting Reagent)] = DH Reaction
© R. W. Kluiber 5/31/2000