Unit 2 - Individual Project_
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Colorado Technical University *
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Dec 6, 2023
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Science and Technology - Laboratory Course:
SCI103
SCI103-2305A-03
|
1.5 Credits
|
Nov 14 - Dec 18
Unit 2 - Individual Project
Review the following videos for help submitting your Individual Project:
●
Submitting Assignments on the CTU Mobile App
●
Submitting Assignments in the CTU Virtual Classroom
Assignment Details
Welcome back, Scientists! Chemistry is all around us. This week, you will explore the impact of pH
by conducting simulated lab and field tests.
●
Start this week with the Unit 2 Learning Path in intellipath
®
(located in the Assignments list).
Here, you will be taught the following fundamental aspects of chemistry that you will need to
complete this week’s lab activity, the Unit 2 Individual Project:
○
pH
○
Acids and bases
○
Acid rain
●
Continue on to the Unit 2 Individual Project (instructions below):
●
Don’t forget to read! You will learn more about the basics of chemistry, such as the following:
○
Types of elements
○
Chemical bonds
○
Chemical reactions
●
Don’t be a stranger! Your instructor loves hearing from you. Let them know how you are
doing this week, and touch base with any questions you might have. You’re doing great!
Lab 2: Measuring pH Levels
For this assignment, you will use the Unit 2 Measuring pH Levels Learning Module to complete the
Unit 2 Lab Report worksheet. You will be conducting simulated lab and field tests to determine pH
levels of collected samples.
1.
If you haven't already, download the
Lab Report worksheet
.
2.
Then, view the
Unit 2 Lab: Measuring pH Levels
to complete the virtual lab and Lab Report
worksheet.
3.
Submit your completed assignment in one of the following ways:
○
Upload your completed Lab Report.
○
Upload an image with your completed Lab Report.
○
Type in your responses to the Lab Report in the IP submission text box.
View the
Individual Project Demo
for guidance on how to submit your Lab Report as an Individual
Project via the Virtual Classroom or the CTU Mobile app.
Please submit your assignment.
Name: Bobbi Penrod
Date: 11/11/23
Instructor’s Name: Donna Hoefner
Assignment: SCI103 Unit 2 Individual Project (Lab Report)
Measuring pH Levels
Instructions:
Enter the Virtual Lab, and conduct the lab tests. Please record your answers on this
Lab Report form. When your Lab Report is complete, submit it to the Submissions area of the
Virtual Classroom.
The pH Scale:
https://youtu.be/Xkrgw2CFwRs
Part I - Lab Tests
: Answer the following questions while in the virtual lab.
Section 1:
You will test 4 known solutions for pH levels using a standard wide-range indicator.
Based on the results obtained in the virtual lab, fill in the following table:
Solution
Number
pH from Lab
Acid, Base, or
Neutral?
Solution Name (What was in the
test tube?)
Solution 1
7
neutral
5 ml of pure water
Solution 2
2
acid
5 ml lemon juice
Solution 3
12
base
5 ml bleach
Solution 4
6
acid
5 ml coffee
Section 2:
Now that you understand how to read pH measurements, follow the virtual lab to
gather pH samples from 3 different lakes. Test these in the virtual lab, and answer the following
questions:
1.
What was the pH level measured at Lake 1? 6
acid
2.
What was the pH level measured at Lake 2? 4 acid
3.
What was the pH level measured at Lake 3? 5 acid
4.
Which two lakes have the highest levels of acidity in their water?
Lake 3 and 2
Part II – Your Examples
: Use the templates below to guide your answers.
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e proton concentrations of three solutions at 25 °C are given
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[H]= 1.0 x 10 ° M
H]=0.00001 M
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cellus.com/StudentFunctions/Interface/acellus_engine.html?ClassID%3D824835429 #
H and pOH Calculations
cids and Bases
What is the pH of a 7.5 × 10-3 M
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pH = [ ? ]
Enter
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The table below shows the tolerance of different species in a body of water.
Critical pH Levels for Aquatic Organisms
Animal
Critical pH Level
Snails
9.
Clams
6.
Bass
5.5
Crayfishes
5.5
Mayflies
5.5
Trout
Salamanders
Perch
4.5
Frogs
4.
Source: U.S. EPA
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To complete the lab report, please answer the following questions.
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Answer:
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terms of actual magnitude of the acidity or basicity of the substance). If the pH of grapefruit juice is 3 (pH = 3), and
the pH of beer is 5 (pH = 5), how many times more acidic is grapefruit juice than beer?
Answer:
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Determine the equivalence point of sudsy ammonia/citric acid reaction by graphing the titration data (pH vs volume citric acid) from Table 1: No Indicator Data Table.
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I
Part 2 Procedure, Data & Analysis:
Recall: The amount of ionization or dissociation of ions
determines the strength of an acid or base. The
concentration of [H3O+], hydronium ion and [OH].
hydroxide ion, can be used to calculate pH and pOH as
shown on the diagram here:
Note: we use [H3O+] and [H*] interchangeably.
1. Click on Water Solution, Graph View, Probe Tool.
Insert the
probe in the
water.
Notice that
given before
2. Fill in the
hydronium
the
the pH.
3. Use the
the pOH.
Equilibrium Concentration (mol/L)
10²
10¹
10⁰
10¹
10
10ª
104
10%
10⁰
107
10⁰
pH: 7.00
2 H₂O H3O+ + OH-
H
1L
4
[H₂O*]
or [H*]
pH
(OH)-1x10¹4
H
(H)-1x10-¹4
-LOUISE
POH-14-PH
pH-14-POH
Show work:
[OH]
LIO - امي
the initial concentration of the solution is
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Time (sec)
PH
[RX]
[H30+]
Ln[RX]
0.000
7.000
0.00002344
0.0000001
-10.6610666
15.000
6.400
0.00001954
0.00000039
-10.8430469
30.000
5.410
0.00001955
0.00000389
-10.8425353
45.000
5.230
0.00001756
0.00000588
-10.94988696
60.000
5.070
0.00001493
0.00000851
-11.11213794
75.000
4.920
0.00001142
0.00001202
-11.3801444
90.000
4.840
0.00000899
0.00001445
-11.6193977
105.000
| 4.780
0.00000685
0.00001659
-11.8912619
120.000
4.750
0.00000566
0.00001778
-12.08208666
135.000
4.720
0.00000439
0.00001905
-12.33618133
150.000
4.700
0.00000349
0.00001995
-12.56569882
165.000
4.670
0.00000207
0.00002137
-13.08796195
180.000
4.670
0.00000207
0.00002137
-13.08796195
195.000
4.660
0.00000157
0.00002187
-13.3644349
210.000
4.650
0.00000061
0.00002283
-14.30980687
225.000
4.650
0.00000061
0.00002283
-14.30980687
240.000
4.640
0.00000061
0.0000229
-14.30980687
255.000
4.640
0.00000061
0.0000229
-14.30980687
270.000
4.640
0.00000061
0.0000229
-14.30980687
285.000
4.630
0.00002344
Undefined
300.000
4.630…
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Time (sec)
pH
[RX]
[H30+]
Ln[RX]
0.000
7.000
0.00002344
0.0000001
-10.6610666
15.000
6.400
0.00001954
0.00000039
-10.8430469
30.000
5.410
0.00001955
0.00000389
-10.8425353
45.000
5.230
0.00001756
0.00000588
-10.94988696
60.000
5.070
0.00001493
0.00000851
-11.11213794
75.000
4.920
0.00001142
0.00001202
-11.3801444
90.000
4.840
0.00000899
0.00001445
-11.6193977
105.000
| 4.780
0.00000685
0.00001659
-11.8912619
120.000
4.750
0.00000566
0.00001778
-12.08208666
135.000
4.720
0.00000439
0.00001905
-12.33618133
150.000
4.700
0.00000349
0.00001995
-12.56569882
165.000
4.670
0.00000207
0.00002137
-13.08796195
180.000
4.670
0.00000207
0.00002137
-13.08796195
195.000
4.660
0.00000157
0.00002187
-13.3644349
210.000
4.650
0.00000061
0.00002283
-14.30980687
225.000
4.650
0.00000061
0.00002283
-14.30980687
240.000
4.640
0.00000061
0.0000229
-14.30980687
255.000
4.640
0.00000061
0.0000229
-14.30980687
270.000
4.640
0.00000061
0.0000229
-14.30980687
285.000
4.630
0.00002344
Undefined
300.000
| 4.630…
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O drain cleaner
ammonia
baking soda
antacid
Next
Save and Exit
Mark this and return
.com/ContentViewers/AssessmentViewer/Activit.
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2-Please help show work and use significant figures
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