| 1. | Safety |
| 2. |
Objectives/Overview |
| 3. |
Procedures |
| 4. | Observations |
|
5. |
Equipment |
| 6. | View
Techniques |
| 7. | |
| 8. | Calculations/Set-ups |
| 9. | Conclusions |
| 10. | Grading Scale |
|
11. |
Sample Report Forms |
|
11. |
Review Prelab Questions |
| 12. | Review Postlab Questions |
Experiment
7
Enthalpy
of Solution
SAMPLE REPORT FORMS
Enthalpy of Solution
| I. Calibration of Thermometer | |||
| a. |
Temperature of boiling water | alcohol thermometer__ | |
| b. |
Temperature of ice/water slurry | alcohol thermometer__ | |
| c. |
Factor = |
line
a - line b |
_____________________ |
| 100 |
|||
| II. Heat Capacity of the Calorimeter | |||
| 1. |
T1,temperature of cool water in calorimeter before mixing | from graph___________ | |
| 2a. |
Temperature of warm water in beaker before mixing | alcohol thermometer__ | |
| 2b. |
T2, corrected temperature of warm water in beaker before mixing (line 2a x factor) | _____________________ | |
| 3. |
Tf, final temperature after mixing (From extrapolation) | extrapolation on graph | |
| *4. |
Temperature increase in cool water, Tf-T1 | ||
| *
5. |
Temperature decrease of warm water, Tf-T2 | ||
| *
6. |
Heat gained by cooler water, qcool | equation 7, pg. 6-4 | |
| *
7. |
Heat lost by the warmer water, qwarm | equation 8. pg. 6-4 | |
| *
8. |
Heat lost to the calorimeter, qcal | equation 6, pg. 6-4 | |
| *
9. |
Heat capacity of calorimeter, Ccal rearrange | equation 9, pg. 6-5 | |
| Observations:
|
|||
| IIIA. Enthalpy of Solution: CaCl2 | |||
| 1. |
Mass of H2O | 100.0 g ______________ | |
| 2. |
Mass of container + CaCl2 | _____________________ | |
| 3. |
Mass of empty container | ___________________ | |
| *
4. |
Mass of CaCl2 | ___________________ | |
| 5. |
Initial Temperature (see graph) | from graph __________ | |
| 6. |
Final Temperature (see graph) | extrapolation on graph | |
| *
7. |
Temperature change, DT | Tf - Ti ______________ | |
| *
8. |
Heat gained (lost) by solution, qsoln | equation 12, pg. 6-6___ | |
| *
9. |
Heat gained (lost) by calorimeter, qcal | equation 13, pg. 6-6___ | |
| *
10. |
Total heat evolved (or absorbed), qrxn | equation 11, pg. 6-6___ | |
| *
11. |
moles of CaCl2 used, n | grams ÷ molar mass__ | |
| *
12. |
Molar enthalpy of solution (J/mol) | equation 14, pg. 6-6___ | |
| Observations:
|
|||
| IIIB. Enthalpy of Solution NH4NO3 | |||
| 1. |
Mass of H2O | 100.0 g _____________ | |
| 2. |
Mass of container + NH4NO3 | ___________________ | |
| 3. |
Mass of empty container | _____________________ | |
| *
4. |
Mass of NH4NO3 | ___________________ | |
| 5. |
Initial Temperature (see graph) | from graph __________ | |
| 6. |
Final Temperature (see graph) | extrapolation on graph | |
| *
7. |
Temperature change, DT | Tf - Ti ______________ | |
| *
8. |
Heat gained (lost) by solution, qsoln | equation 12, pg. 6-6___ | |
| *
9. |
Heat gained (lost) by calorimeter, qcal | equation 13, pg. 6-6___ | |
| *
10. |
Total heat evolved (absorbed), qrxn | equation 11, pg. 6-6___ | |
| *
11. |
moles of NH4NO3 used, n | grams ÷ molar mass___ | |
| *
12. |
Molar enthalpy of solution (J/mol) | equation 14, pg. 6-6___ | |
| Observations:
|
|||
