Exp. B Bomb Calorimetry
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
Bomb Calorimetry:6
© P.S.Phillips August 2, 2009
1)
What is the recommended mass of analyte to be placed in combustion cup? What may happen if this value is
exceeded significantly?
2)
Before firing the bomb, the temperature is read a number of times. What is the interval and number of
readings suggested for this process?
3)
The calorie and the joule are both units of energy. What is the conversion factor to convert calories into
joules? The Calorie unit (capital “C”) is often used to measure nutritional energy equivalents. How many calories
(lower case “c”) are there in one Calorie?
© P.S.Phillips August 2, 2009
Bomb Calorimetry:7
Name:
Experiment:
B
Chemistry 210
Lab. Report Title Page.
BOMB CALORIMETRY: THE ENERGY OF COMBUSTION
Date Experiment Performed:
Partners Name:
Complete and staple one of these sheets (or a copy) to the front of each lab.
Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
Bomb Calorimetry:8
© P.S.Phillips August 2, 2009
For lab. profs. use only:
Your Mark
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Comments:
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Bomb Calorimetry:9
Part A. Calibration
Mass of benzoic acid pellet
__________ g
Starting Temperature (obtained graphically)
__________ C
Final Temperature (obtained graphically)
__________ C
Length of wire consumed
__________ cm
Wire correction
__________ J
Energy equivalent for the calorimeter
__________ kJ/C
Bomb Calorimetry:10
© P.S.Phillips August 2, 2009
Calibration.
Time
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Temperature
Time
Temperature
Bomb Calorimetry:11
Bomb Calorimetry:12
© P.S.Phillips August 2, 2009
Part B. Heat of Combustion
Mass of ____________________ pellet
__________ g
Starting temperature (from graph)
__________ C
Final temperature (from graph)
__________ C
Length of wire consumed
__________ cm
Wire correction
__________ J
Energy of combustion of sample
__________ kJ
Energy of combustion per gram of sample
__________ kJ/g
Energy of combustion per mole of sample, ΔE
__________ kJ/mol
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Bomb Calorimetry:13
Sample Run.
Time
Bomb Calorimetry:14
Temperature
Time
Temperature
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© P.S.Phillips August 2, 2009
Bomb Calorimetry:15
1) ) Calculate the enthalpy of combustion, ΔHcomb., of the cereal, in kJ/mole, from your experimental data. (Note the
kJ/mole, that implies the molecular weight, assume the cereal is pure carbohydrate, write a balanced equation, and go
from there). Strictly you should correct ΔEcomb. to ΔHcomb., but they turn out to be nearly identical for cereal (why?).
Compare your experimental value with a “literature” value and explain any difference. Quote the reference source. (The
latter will be the box in the supermarket if your sample was a cereal). Also, compare the value with glucose. Explain any
significant differences from the latter.
Bomb Calorimetry:16
© P.S.Phillips August 2, 2009
2) List the possible sources of error and their effects in bomb calorimetry. Where applicable, state how the equipment
design of the instrument minimizes those errors.
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Bomb Calorimetry:17
Exp. C c.m.c.
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips August 2, 2009
Micelles:3
1)
What important property is possessed by micelle-forming materials? Give the name of the property and describe
the structural characteristics.
2)
What is the diameter of a typical micelle? How many surfactant molecules will it contain ?
3)
What is equivalent conductance.
Micelles:2
© P.S.Phillips August 2, 2009
Name:
Experiment:
C
Chemistry 210
Lab. Report Title Page.
MICELLES
Date Experiment Performed:
Partners Name:
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Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
For lab. profs. use only:
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Micelles:5
Your Mark
_____/
Comments:
Micelles:2
© P.S.Phillips August 2, 2009
Exp. E Partitioning
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips. August 2, 2009
Partition Coefficient : 5
1)
In this experiment, the acid-base indicator is highly soluble in water at high pH but at low pH it is more
soluble in octanol. Why ?
2)
What species are we measuring by monitoring the absorbance at 508 nm?
3)
Why do you need to work in the fume hood for this experiment ?
© P.S.Phillips. August 2, 2009
Partition Coefficient : 6
Name:
Experiment:
E
Chemistry 211.
Lab. Report Title Page.
PARTITION COEFFICIENT
FORMAL LAB.: PLEASE ATTACH THIS TO THE FRONT OF THE REPORT
Date Experiment Performed:
Partners Name:
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Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
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Partition Coefficient : 7
For lab. profs. use only:
Your Mark
_____/ 10
Comments:
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Partition Coefficient : 8
Exp. H Solution Calorimetry
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips August 2, 2009
Solution Calorimetry:7
1)
The chart recorder is zeroed on the left side for the glycine part of the experiment and on the right side for the
TRIS part of the experiment. Why are the two parts zeroed differently ?
2)
The temperature change is measured from the plot of temperature vs. time. What point is best to measure
∆Tc? Would ∆Tc be different at some other point?
© P.S.Phillips August 2, 2009
Solution Calorimetry:8
Name:
Experiment:
H
Chemistry 210
Lab. Report Title Page.
HEAT OF SOLUTION
FORMAL LAB REPORT. ATTACH THIS COVER PAGE.
Date Experiment Performed:
Partners Name:
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Do not submit lab. reports in binders or books unless otherwise instructed.
Marker’s Name:
For lab. profs. use only:
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Solution Calorimetry:9
Your Mark
_____/
Comments:
© P.S.Phillips August 2, 2009
Solution Calorimetry:10
Exp. K Kinetics
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. Manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
June 6, 2008
EXPERIMENT K:1
1)
Why is the enzyme catalase used as the catalyst in one of the runs rather than iodide ?
2)
Why does the water level in the two burettes need to be equal when reading the volume change ?
3)
The rate of production of oxygen gas depends primarily on the decomposition reaction but also on a
mechanical aspect of the experimental apparatus. What is this mechanical aspect and why does it influence the
rate of gas production ?
EXPERIMENT K:2
June 6, 2008
Name:
Experiment:
K
Chemistry 201.
Lab. Report Title Page.
RATE OF DECOMPOSITION OF H2O2
Date Experiment Performed:
Partners Name:
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Marker’s Name:
June 6, 2008
EXPERIMENT K:3
For marker’s use only:
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_____/ 10
Comments:
EXPERIMENT K:4
June 6, 2008
Run 1.
Time
June 6, 2008
Volume
Time
Volume
Time
Volume
Time
Volume
EXPERIMENT K:5
Run 2.
Time
Volume
Time
Volume
Room Temperature: ___________ C
Vi(trial 1):___________ mL
EXPERIMENT K:6
Time
Volume
Time
Volume
Room Pressure: ___________ mmHg
Vi(trial 2):____________ mL
June 6, 2008
1. Using the data from Run 1 obtain the order of the reaction with respect to H2O2. You will need the value of PoH2O
at 25C. C should be in mole.L-1 and time in seconds. (You’ll need to add a few sheets of graph paper to these data
sheets).
2. From the first few data points in Runs 1 and 2, obtain the values for dC/dt (or d[O2]/dt) and determine an integer
value for the order of the reaction with respect to I-.
June 6, 2008
EXPERIMENT K:7
3. Determine the average rate constant for the reaction at 25C
4. Is the half-life of this reaction independent of the [H2O2] for a particular concentration of catalyst? Explain.
EXPERIMENT K:8
June 6, 2008
Exp. O Osmosis
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips August 2, 2009
Permeability:5
1)
In this experiment, a plot of ln(Vi°-mi(t)) vs. t produces a straight line. What quantity can we obtain from the
slope of this line? Give the appropriate equations.
2)
What is the most important step that should be performed before weighing the dialysis bag ?
3) How does Gortex work ? (Just for fun).
Permeability:6
© P.S.Phillips August 2, 2009
Name:
Experiment:
O
Chemistry 210
Lab. Report Title Page.
OSMOSIS & PERMEABILITY
FORMAL LAB.: PLEASE ATTACH THIS TO THE FRONT OF THE REPORT
Date Experiment Performed:
Partners Name:
Complete and staple one of these sheets (or a copy) to the front of each lab.
Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
For lab. profs. use only:
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Permeability:7
Your Mark
_____/
Comments:
Permeability:8
© P.S.Phillips August 2, 2009
Exp. P Phase Diagram
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
Phase Diagram:1
August 2, 2009
1)
What masses of biphenyl and naphthalene are required to make exactly 10.0 g of 0.75 mole fraction (X) of
naphthalene ?
2)
The heat of fusion is found from the slope of the line obtained by plotting a portion of the cooling curve data.
For this graph, what is plotted on the y and x axes ?
3)
What are the units of the slope from the plot? How do you convert this value into ∆Hfus ?
August 2, 2009
Phase Diagram:2
Name:
Experiment:
P
Chemistry 210
Lab. Report Title Page.
A SIMPLE PHASE DIAGRAM
Date Experiment Performed:
Partners Name:
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Lab. Profs. Name:
Phase Diagram:3
August 2, 2009
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_____/
Comments:
August 2, 2009
Phase Diagram:4
Run 1.
Time
Phase Diagram:5
Temperature
Time
Temperature
August 2, 2009
Run 2.
Time
August 2, 2009
Temperature
Time
Temperature
Phase Diagram:6
Your data.
Weight of diphenyl
_______________ g
Weight of napthalene
_______________ g
Mole fraction(assigned)
_______________
Mole fraction(actual)
_______________
Break
_______________ C
_______________C
Arrest
_______________ C
_______________C
QUESTIONS.
1) From your data determine ΔHfus for both naphthalene and diphenyl and compare with the literature values.
Phase Diagram:7
August 2, 2009
2) Discuss your cooling curve in terms of the phase rule (just annotate one of your graphs).
Use these pages or attach your own graphs.
August 2, 2009
Phase Diagram:8
Phase Diagram:9
August 2, 2009
August 2, 2009
Phase Diagram:10
Exp. S Spectrophotometry
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
02/08/2009
Spectrophotometry:1
1)
When making a dilution series, what 3 rules should be followed? What may occur if these rules are not
followed ?
2)
What safely precautions are followed when handling and then boiling the solution containing
concentrated sulphuric acid in Procedure 1 ?
3)
What function do the persulphate and periodate ions serve in this experiment ?
Spectrophotometry:2
02/08/2009
Name:
Experiment:
S
Chemistry 210
Lab. Report Title Page.
SPECTROPHOTOMETRIC ANALYSIS
Date Experiment Performed:
Partners Name:
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Lab. Profs. Name:
02/08/2009
Spectrophotometry:3
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Your Mark
_____/
Comments:
Spectrophotometry:4
02/08/2009
Unknown No. __________
Solution
Chromium
standard
Manganese
standard
Conc. chromium in
unknown
Conc. manganese in
unknown.
Please attach your own copy of the spectra to the back.
Conc. mol/L
Abs. at ________nm
Abs. at ________nm
1) Calculate the ε values at each wavelength for the two standards.
02/08/2009
Spectrophotometry:5
2) Calculate the concentration of chromium and manganese in the unknown.
Spectrophotometry:6
02/08/2009
3) Briefly outline your dilution procedure.
Mass of potassium dichromate __________________ g
Conc. of stock 1 ________________ mM
Conc. of stock 2 ________________ mM
4) It might have been more convenient to use 1, 2, 3, 4, 5 mL pipettes to prepare the calibration standards. Why don’t we
use them?
02/08/2009
Spectrophotometry:7
5) Are your results consistent with what you know about the composition of steels ?
6) Compare the results of procedures I and II and comment. (Compare extinction coeefs.). Attach calibration graph.
Spectrophotometry:8
02/08/2009
Exp. T Titrimetry
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips August 2, 2009
Titrimetry:5
1)
What is the pH of a solution of 0.100M HCl?
2)
Why does glycine have two pK values? Give the structure and show the two protonation steps that give
rise to the two pK values.
Titrimetry:6
© P.S.Phillips August 2, 2009
Name:
Experiment:
T
Chemistry 210
Lab. Report Title Page.
ACID-BASE TITRATION
FORMAL LAB.: PLEASE ATTACH THIS TO THE FRONT OF THE REPORT
Date Experiment Performed:
Partners Name:
Complete and staple one of these sheets (or a copy) to the front of each lab.
Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
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Titrimetry:7
For lab. profs. use only:
Your Mark
_____/
Comments:
Titrimetry:8
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Exp. W Wine
PRELAB: The prelab. must completed prior to the beginning of
the lab period and handed in before any lab work may be started.
Make sure you read the safety instructions.
See the start of the lab. manual for further details.
Name:
Purpose of experiment (briefly).
Please answers the questions overleaf:
© P.S.Phillips August 2, 2009
Buffering:3
1)
Define buffer capacity ?
2)
What is the Henderson-Hasselbach equation? Based on the equation, when will pH = pK? How is this
related to Ve, the equivalence point?
Buffering:4
© P.S.Phillips August 2, 2009
Name:
Experiment:
W
Chemistry 210
Lab. Report Title Page.
BUFFER CAPACITY OF A WINE
FORMAL LAB.: PLEASE ATTACH THIS TO THE FRONT OF THE REPORT
Date Experiment Performed:
Partners Name:
Complete and staple one of these sheets (or a copy) to the front of each lab.
Do not submit lab. reports in binders or books unless otherwise instructed.
Lab. Profs. Name:
© P.S.Phillips August 2, 2009
Buffering:5
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Your Mark
_____/
Comments:
Buffering:6
© P.S.Phillips August 2, 2009