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1 Experiment 7 – Beer’s Law: Post-Lab (60 Total Pts) Post-Lab Results & Data Analysis Base Instructions for All Post-Labs Own Work Policy: All content submitted in this Post-Lab, with the exception of raw data from the In-Lab, must be your own work. Per the syllabus, you are not allowed to work on any post-lab questions or data workup with other students. This includes your lab partner. Any violation of this rule will be reported to the CHEM 101L instructor, and major or repeated offenses may result in referral to the Honor Court. Note that this requirement does not mean that you cannot receive assistance from TAs during office hours, and we encourage you to use this resource if you are having trouble. Figure Captions:
For each figure caption, please provide just enough information about the graph/plot so that the reader understands what is being displayed. Usually, the first sentence gives an overview, and the following sentences give specifics. Example:
“Reaction yield as a function of added catalyst with reaction yield determined by absorption measurements. Reactions were held at a constant temperature of 22±2 °C. Concentrations of all other reactants were kept constant at the values shown in Table 9. Each data point is the average of three trials.” Table Titles:
Each table should include a one phrase title that describes the contents of the table. The title should be understandable without needing to read what’s in the lab manual.
Example:
“Rate constants for substitution reaction A as a function of temperature.” Units for Table Entries:
For each entry in a table, units should be included in the column header unless the quantity is unitless. Units are generally not included in the body of the table itself to avoid clutter. Submission to Gradescope: When uploading to Gradescope, you will need to indicate which page each table, figure, or question is located on. Failure to do so will result in a point deduction for formatting errors. To do this, select the item from the Question Outline on the left side of the screen. Then, on the right side of the screen, select the page from your submission that contains this item.
CHEM 101L - Experiment 7 Post-Lab Fall 2023
2 A. Beer’s Law Calibration Plot (
6 points
)
Provide your Beer’s law calibration plot below. You may use either your Excel or your Vernier Graphical Analysis Plot, but you must include axes labels, a key/legend, and a linear trendline. You should have only one trendline for all 15 data points. Figure 1. Beer’s Law calibration plot expressing absorbance at 507 nm versus concentration (mol/L). Each data point is an average of 3 trials. Beer’s Law Calibration Plot: Absorbance vs Concentration
CHEM 101L - Experiment 7 Post-Lab Fall 2023
3 B. Calculating Concentrations Using the Beer’s Law Calibration Plot (
10 points
)
This section of the Post-lab is intended to guide you through the application of Beer’s law to determine concentration from an absorbance measurement. Follow along with the instructions and show your work in the answer box below. You may choose to upload an image of your work done by hand, but it must be legible. a) Re-arrange the equation for Beer’s law (
A =
ε
·
ℓ
·
c
) so that concentration, c
, is the only value on the right side of the equation. Then flip the sides so that c is on the left (i.e c = …
) b) Record the value of the path length, ℓ
, of the cuvettes used in this experiment. c) Record the value of molar absorptivity, ε
. The value of ε
is the slope of the linear fit of the Beer’s law calibration plot above. d) Rewrite the re-arranged equation from part a)
by substituting the values of ε
and ℓ
from parts b)
and c)
, respectively. e) Select one of the trials in which you measured the absorbance of your Gatorade sample. Starting from the equation you found in part d)
, find the concentration, c
, of this sample from its absorbance, A
. Please show your work, including units and the appropriate number of significant figures. a. c=A/ ε* ℓ b. ℓ=1.000 cm c. ε=20160 ࠵?
!࠵?
࠵?࠵?
!࠵?
d. c=.023 /20160 ࠵?
e. concentration is in M, not units in image
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Question 6
Find the major product of following dehydration.
OH CH3
CH,-CH-CH-CH2-CH3
+ H20
CH3
OA CH2=CH-ĊH-CH2-CH3
OCH3
O B. CH3-C=c-CH2-CH3
OC. CH3-C-CH,-
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O CH3
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CH3
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Descriptives
Bronchial reactivity
95% Confidence Interval for
Mean
Mean
Std. Deviation
Std. Error
Lower Bound Upper Bound
Minimum
Maximum
Sulfur dioxide
6.806
5
18.840
9.6919
4.3344
30.874
5.1
30.1
Nitrous dioxide
6
6.617
3.9448
1.6105
2.477
10.757
2.2
11.9
Oxygen
4
4.975
3.4092
1.7046
-450
10.400
2.1
9.3
Total
15
10.253
8.6514
2.2338
5.462
15.044
2.1
30.1
ANOVA
Bronchial reactivity
Sum of
Squares
dr
Mean Square
F
Sig.
Between Groups
559.450
2
279.725
6.873
.010
Within Groups
488.408
12
40.701
Total
1047.857
14
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Experiment 605_Hydrates_1_2_1 (1) (Protected View) - Word (Unlicensed Product)
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Post-lab Questions
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1. Calculate the mass percent of water for the hydrate, LINO,-3H;O.
2. What will be the probable effect if you kept the crucible completely covered during the entire
heating and cooling processes? Would your calculated percent water in the hydrate be high, low, or
unaffected? Explain.
3. If 2.752 g sample of Ca(NO:); XH;O is heated to constant mass, the residue weighs 1.941 g.
Determine the value of x and the formula of the hydrate.
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Please upload your full solution to the following problem.
For the experimental isotherm data given below, determine the Freundlich and Langmuir isotherm
parameters. Apply linear regression to determine the isotherm parameters. A spreadsheet can be used
for this purpose. Which of the two isotherms better describes the data?
Experimental data:
Carbon type: F-400
Carbon size: 200 × 400
. Chemical: Trichloroethene, C₂HCl3 (131.39 g/mol)
Temperature: 13 C
pH: 7.5-8
Equilibrium time: 31 days
●
Ⓡ
B
B
Sample
number
123456
TCE Liquid-Phase
Concentration
CA. μmol/L
23.6
6.67
3.26
0.322
0.169
0.114
TCE Adsorbent-Phase
Concentration
9A, μmol/g
737
450
318
121
85.2
75.8
2
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Data Collection
Kinetic Data Collection
Time, t (s)
Volume of added base (mL)
First addition
40
0.50
Second addition
101
1.00
Third addition
160
1.52
Fourth addition
224
1.99
Fifth addition
278
2.49
Sixth addition
334
3.01
Seventh additlon
389
3.48
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Concentration of NaOH stock solution:
0.01 M
Concentration of t-BuCl stock solution:
0.2 M
Volume of t-BuCl solution:
10 mL stock stock solution added to 25 mL acetone
Table view
List view
Kinetic Data
Volume of
Moles of Amount of
t-Bucl
(mol)
[-Buc]
In[-BuC
Time, t (s) added base added base
(mL)
(mol)
First
addition
40
0.50
Second
additlon
101
1.00
Third
addition
160
1.52
Fourth
addition
224
1.99
Flfth
additlon
278
2.49
Sixth
additlon
334
3.01
Seventh
addition
389
3.48
Use the data in the table above to plot In[t-BuC]]; vs time (s). Include labelled axis, a title, and a
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Chart Title
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0.112
0.4
0.167
0.5
0.1980
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0.2436
Absorbance at 595nm
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4y = 0.4499x - 0.0254
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0.25
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0.05
0.1
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0.4
0,5
0.6
0.7
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7
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Complete the balanced molecular chemical equation for the reaction
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Give the nuclear symbol (isotope symbol) for the isotope of bromine, Br, that contains 46 neutrons per atom. Replace the
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HELP !!!!!!!!! PLEASE HELP ME ON THE DARK BULLET POINT TABLE CALCULATION. BE SURE UPLOAD THE GRAPH. make sure Answer all of them
Experiment 1
Exact concentration of H2O2 stock solution (M)
1.014
Temperature of water bath (°C)
24
Experiment 1: Volume of O2 vs time for decomposition of H2O2
Time (min)
Volume of O2 (mL)2.0
0.00
4
1.22
6
2.41
8
3.64
10
4.93
12
6.34
14
7.78
16
9.49
18
10.99
20
12.35
22
14.64
24
16.31
26
19.16
28
20.97
30
24.52
32
26.03
34
28.99
36
32.30
38
35.17
40
38.83
42
44.83
44
50.50
46
58.26
48
63.46
Experiment 2: Volume of O2 vs time for decomposition of H2O2
Time (min)
Volume of O2 (mL)2.0
0.00
4
0.63
6
1.31
8
1.96
10
2.42
12
2.93
14
3.56
.
Experiment 3: Volume of O2 vs time for decomposition of H2O2
Time (min)
Volume of O2 (mL)2.0
0.00
4
0.45
6
0.88
8
1.44
10
2.29
12
2.92
14
3.51
Calculations
For all three experiments plot the volume of O2 evolved in…
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What is the main difference between a qualitative analysis and a quantitative
analysis of a solution?
The two must be done independently of each other, as they are completely
unlike.
A qualitative analysis must always be done before a quantitative analysis.
A quantitative analysis must always be done before a qualitative analysis.
A qualitative analysis identifies the type of ion in solution and the quantitative
analysis will determine how much of this ion is present.
A quantitative analysis identifies the type of ion in solution and the qualitative
analysis will determine how much of this ion is present.
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- Descriptives Bronchial reactivity 95% Confidence Interval for Mean Mean Std. Deviation Std. Error Lower Bound Upper Bound Minimum Maximum Sulfur dioxide 6.806 5 18.840 9.6919 4.3344 30.874 5.1 30.1 Nitrous dioxide 6 6.617 3.9448 1.6105 2.477 10.757 2.2 11.9 Oxygen 4 4.975 3.4092 1.7046 -450 10.400 2.1 9.3 Total 15 10.253 8.6514 2.2338 5.462 15.044 2.1 30.1 ANOVA Bronchial reactivity Sum of Squares dr Mean Square F Sig. Between Groups 559.450 2 279.725 6.873 .010 Within Groups 488.408 12 40.701 Total 1047.857 14arrow_forwardExperiment 605_Hydrates_1_2_1 (1) (Protected View) - Word (Unlicensed Product) ces Mailings Review View Help Foxit PDF Tell me what you want to do contain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing ir Office product is inactive. To use for free, sign in and use the Web version. Post-lab Questions Activate Use free at Office.cc 1. Calculate the mass percent of water for the hydrate, LINO,-3H;O. 2. What will be the probable effect if you kept the crucible completely covered during the entire heating and cooling processes? Would your calculated percent water in the hydrate be high, low, or unaffected? Explain. 3. If 2.752 g sample of Ca(NO:); XH;O is heated to constant mass, the residue weighs 1.941 g. Determine the value of x and the formula of the hydrate.arrow_forwardPlease upload your full solution to the following problem. For the experimental isotherm data given below, determine the Freundlich and Langmuir isotherm parameters. Apply linear regression to determine the isotherm parameters. A spreadsheet can be used for this purpose. Which of the two isotherms better describes the data? Experimental data: Carbon type: F-400 Carbon size: 200 × 400 . Chemical: Trichloroethene, C₂HCl3 (131.39 g/mol) Temperature: 13 C pH: 7.5-8 Equilibrium time: 31 days ● Ⓡ B B Sample number 123456 TCE Liquid-Phase Concentration CA. μmol/L 23.6 6.67 3.26 0.322 0.169 0.114 TCE Adsorbent-Phase Concentration 9A, μmol/g 737 450 318 121 85.2 75.8 2arrow_forward
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ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
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ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY