Report for Experiment 4
REPORT
THERMOCHEMISTRY: ENTHALPY OF SOLUTION
Student Nam e:
Date:
Lab Day: MonAM-086 MonPM-087 Tue AM-093 Tue PM-096 W edAM-088
W edPM-097/098 ThursAM-085 ThursPM-089
FriAM-092
W edAM-094 W edPM-095 ThursAM-090 ThursPM-091 FriAM -099
(Circle the lab day you are registered in)
Lab Partner: __________________________
DATA:
Calibration of Thermometers
Atmospheric pressure: _____________________
Thermometer 1
W ater Ice Bath Temp ( BC)
W ater Boiling Temp ( BC)
Thermometer 2
W ater Ice Bath Temp ( BC)
W ater Boiling Temp ( BC)
Heat Capacity of the Calorimeter
A1:
A2:
Mass of Calorimeter /g
Mass of Calorimeter + Cold W ater /g
Mass of Cold W ater /g (A2 – A1)
Temperature of Cold W ater °C (Therm 1)
Temperature of Hot W ater °C (Therm 2)
Final Temperature of W ater °C (Therm 1)
Mass of Calorimeter + Cold W ater + Hot W ater /g
Mass of Hot W ater /g (A3-A2)
-1-
measured
corrected
measured
corrected
measured
corrected
A3:
4
Report for Experiment 4
Heat of Neutralization Concentration of HCl ________ Concentration of NaOH ________
Trial 1
Trial 2
A. Mass of calorimeter /g
B. Mass HCl and calorimeter / g
C. Mass calorimeter, HCl and NaOH / g
D1. Mass HCl / g (B - A)
D2. Mass NaOH /g (C - B)
Mass of Solution (D1 + D2)
Initial temp. HCl measured / oC (therm 1)
Initial temp. HCl corrected / oC
Initial temp. NaOH measured / o C (therm 2)
Initial temp. NaOH corrected / oC
E. Average Initial Temp corrected /BC
Final temp. measured / oC (therm 1)
F. Final temp. corrected / oC
G. Temp. change corrected / oC
(F - E)
Precision of Volumetric Glassware
Mass of
Vial
GROUP DATA
50 mL Beaker
50 mL Graduated Cylinder
Pipette
(g)
Mass of Calculated
Vial and Mass of
Water
Water
(g)
(g)
2 ND Group Data
50 mL Beaker
50 mL Graduated Cylinder
Pipette
3 rd Group Data
50 mL Beaker
50 mL Graduated Cylinder
Pipette
4 th Group Data
50 mL Beaker
50 mL Graduated Cylinder
Pipette
-2-
Trial 3
Trial 4
Report for Experiment 4
TREATMENT OF DATA
1. A student gets the following results when calibrating his thermometer. The
atmospheric pressure is 703.0 mmHg.
Thermometer 1
W ater Ice Bath Temp ( BC)
-0.5
W ater Boiling Temp ( BC)
97.3
The student uses this thermom eter to take the temperature of a solution and finds the
temperature to be 46.3B C. W hat is the corrected temperature? (Show w ork)
-3-
Report for Experiment 4
2.
A student gets the follow ing data for the Heat Capacity of her calorimeter .
43.5
A2: 94.2
A1:
M ass of Calorimeter /g
M ass of Calorimeter + Cold W ater /g
M ass of Cold W ater /g (A2 – A1)
Temperature of Cold W ater °C (Therm 1)
21.3
measured 45.2
measured 30.0
A3: 144.7
measured
Temperature of Hot W ater °C (Therm 2)
Final Temperature of W ater °C (Therm 1)
M ass of Calorimeter + Cold W ater + Hot W ater
corrected
corrected
corrected
/g
M ass of Hot W ater /g (A3-A2)
The mcalib is 0.969 and bcalib is 2.0B C for both Thermometer 1 and Thermometer 2.
Determine the heat capacity of the calorimeter.
-4-
Report for Experiment 4
3.
A student gets the follow ing data for the heat of neutralization trials using 1.0 M NaOH and
1.0 M HCl.
Trial 1
43.5
A. M ass of calorimeter /g
B. M ass HCl and calorimeter / g
64.0
C. M ass calorimeter, HCl and NaOH / g
85.0
D1. M ass HCl / g (B - A)
D2. M ass NaOH /g (C - B)
M ass of Solution (D1 + D2)
Initial temp. HCl measured / oC (therm 1)
22.1
o
Initial temp. HCl corrected / C
Initial temp. NaOH measured / oC (therm 2)
21.6
Initial temp. NaOH corrected / oC
E. Average Initial Temp corrected /BC
Final temp. measured / oC (therm 1)
28.8
o
F. Final temp. corrected / C
G. Temp. change corrected / oC
(F - E)
Using this data, determine the Molar Enthalpy of Neutralization for this trial.
The mcalib is 0.969 and bcalib is 2.0BC for both Thermometer 1 and Thermometer 2 and
the calculated heat capacity of the calorimeter was 33 J °C-1 .
-5-
Report for Experiment 4
4. a) Give a Reported Value as is described in your lab manual, for the volume of water delivered
by the beaker, the graduated cylinder and the pipet. (use your data and the 3 other groups data).
(See pages 15-17 of lab manual to see how to give a Reported Value for each. This includes the
standard deviation and number of trials.)
b) Assuming that 10.00 mL of water weighs 9.9997 g (literature value) calculate the percent error
for each of the 3 types of glassware we used to deliver 10 mL of water to a vial. (Show one sample
calculation.) c) Which of the 3 types of glassware seemed to deliver a volume closest to 10 mL?
(If you need more room, use other side of page.)
5. Using the data your group obtained in this lab, report the following. (Note
remember to corrrect your temperatures when doing your calculations and factor in
the heat capacity of your calorimeter.)
Summary of the molar enthalpy of solution results for each salt (Remember units)
Thermometer 1: mcalib ___________ bcalib __________
Thermometer 2: mcalib ___________ bcalib __________
Heat Capacity of Calorim eter: ____________
Heat of Solutions:
Molar Heat of Neutralization (ªH)
Trial 1
______
Trial 2
______
Average Molar Heat of Neutralization (ªH) _________
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Trial 3
______
Trial 4
_____