Calorimetry lab - Kaliha Dennis

.docx

School

Queens University *

*We aren’t endorsed by this school

Course

112

Subject

Chemistry

Date

Apr 3, 2024

Type

docx

Pages

4

Uploaded by Kaliyharoses

Report
Experiment 6. Name: Kaliha Dennis Partner: George iibawi Student No:20340139 Student No: 20420607 Lab Section:49 Bench # (on computer screen): 2 Experiment 6. (1 week) (LCA) Calorimetry Purpose The purpose of this experiment is to analyze the enthalpy change of two commonplace chemical process Introduction The first law of thermodynamics indicates that the energy of a system will change by the exchange of heat, q , or by work being done on or by the system. This where Change U = q+w where change in U is the energy of the overall system. The q of the system is positive if heat enters and negative If heat is leaving the system. When W, the work is negative it means that work is being done by the system, and if it is positive when the system has work done on it. When the system is isolated, no work can be done on the system, as well as heat cannot escape, therefore, the change in enthalpy would be zero 1 . Δ 𝑈 = 𝑞 + w This experiment looks at using a constructed calorimeter to control the heat flow of a reaction. When the volume of the system is held constant, like the bomb calorimeter the change in heat is equalled to the change in enthalpy 1 . Δ 𝐻 = 𝑞 p In this experiment a adiabatic process is occurring where no heat can enter or leave the system. The system consists of an inner beaker and water. The overall energy of the system can calculate with the identification and summation of react, the change in reaction and qtemp, which is the change in thermal energy 1 . 𝑞 system = 0 = 𝑞 react + 𝑞 temp With this, the change in thermal energy is calculated using the heat capacity of the system components multiplied by the change in temperature of the overall system 1 . 𝑞 temp   = 𝐶 system Δ 𝑇 = [ 𝐶 water + 𝐶 beaker ]ΔT 1
Experiment 6. Procedure Part A: Determining the Enthalpy of Dissociation of Ammonium Nitrate 1. Determine the mass of the 150 mL beaker. 2. Have one partner assemble the calorimeter, while the other sets up Logger Pro in the next step. a. Fold a piece of paper towel and wrap it around the 150 mL beaker, then put it into the 250 mL beaker. b. Place the two beakers on the hot plate/magnetic stirrer with the stir bar inside the smaller beaker, not turning on the heat c. Place the cardboard lid on top of the beakers d. Use the clamp and retort stand to secure the temperature probe and measure the internal temperature of the calorimeter. 3. Start up Logger Pro and connect the temperature probe to the USB hub 4. Select the Data Collection icon in the toolbar on the top of the screen and change the Mode to Time Based, Duration to 300 seconds, Sampling/Second to 0.5 (NOT Seconds/Sample). This will change the Seconds/Sample to 2 automatically. 5. Point Symbols and uncheck the Connect Points box and click on Latest Temperature. Select the Options tab at the top and change Display to every One point and change the Size to Small. 6. Pour 100.0 mL of RO water into the calorimeter and turn on the stir bar to 300 rpm/Monitor the temperature, ensuring stability. In addition, weigh out 3.0 g of ammonium nitrate crystals using top load balance  7. . Click [ Collect ] and the computer will automatically begin to measure and plot the temperature of the water inside the calorimeter. After establishing a good baseline of constant temperature (at least 30 seconds), quickly add the crystals to the calorimeter and close the lid. Continue data collection for the remainder of the 300 seconds.123 8. Record the AT of the reaction using the baseline at the top of the graph as T1 and the bottom of the plateau as T2. You can get exact numbers by looking at the individual data points shown on the spreadsheet to the left of the graph. No need to copy this graph to your report. 9. Rinse the contents of your calorimeter into the Waste Ammonium Nitrate bottle. Wash and dry the150 mL beaker and reset the calorimeter for part B. Part B: Determining the Enthalpy of Absorption by Sodium Polyacrylate 1. Weigh 3.0g of sodium polyacrylate 2. measure and pour 100.0 mL of RO water into the inner 150 mL beaker of the calorimeter. Turn on the stir bar. 3. Start collecting data points once the temperature of the water has reached equilibrium. Then, carefully add the sodium polyacrylate and close the lid of the calorimeter. Turn off the stir bar after all the polymer is added. Continue collecting for remaining 300 seconds. 4. Rescale the graph to get a more detailed view of the data points. 5. Record the AT of the reaction using the baseline at the bottom of the graph as T1 and the top of the plateau as T2. 6. Empty the contents of the calorimeter into the Waste Sodium Polyacrylate container. Data and Observations Part 1 Mass of Beaker = 83.360(1)g 2
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Recommended textbooks for you
Text book image
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry: An Atoms First Approach
Chemistry
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Cengage Learning
Text book image
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
Text book image
General Chemistry - Standalone book (MindTap Cour...
Chemistry
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Cengage Learning
SEE MORE TEXTBOOKS
Recommended textbooks for you
  • Text book image
    Chemistry for Engineering Students
    Chemistry
    ISBN:9781337398909
    Author:Lawrence S. Brown, Tom Holme
    Publisher:Cengage Learning
    Text book image
    Chemistry
    Chemistry
    ISBN:9781305957404
    Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
    Publisher:Cengage Learning
    Text book image
    Chemistry: An Atoms First Approach
    Chemistry
    ISBN:9781305079243
    Author:Steven S. Zumdahl, Susan A. Zumdahl
    Publisher:Cengage Learning
  • Text book image
    Chemistry
    Chemistry
    ISBN:9781133611097
    Author:Steven S. Zumdahl
    Publisher:Cengage Learning
    Text book image
    Chemistry: Principles and Practice
    Chemistry
    ISBN:9780534420123
    Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
    Publisher:Cengage Learning
    Text book image
    General Chemistry - Standalone book (MindTap Cour...
    Chemistry
    ISBN:9781305580343
    Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
    Publisher:Cengage Learning
Text book image
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry: An Atoms First Approach
Chemistry
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Cengage Learning
Text book image
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
Text book image
General Chemistry - Standalone book (MindTap Cour...
Chemistry
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Cengage Learning
SEE MORE TEXTBOOKS