Lab 2
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Lab 2 pH and Water lab Results (
estimated time: 2 hours
)
Online assignment instructions: You will work individually on the exercise below and turn in your worksheet by the deadline.
Note: please complete the worksheet below with some results provided. Although you may engage in
general discussions of problems with other students, your professors, or anyone else about your thinking,
you must answer all questions on your own. Do not use old lab reports, papers from current or previous
biology students as all materials will be part of the Quiz and Exam.
Exercise I. pH of common household solutions.
pH of common household solutions: Use two methods to determine the pH of various solutions.
1.
Use the pH paper handed out and check as many solutions that you can find around your residence.
2.
Use one or multiple internet resources to find the pH of at least 20 solutions listed on your lab
worksheet. Then, at the end of p. 23, list these sources that you have used to obtain your data. For
example: http://www.chemistryexplained.com/A-Ar/Acid-Base-Chemistry.html
WORKSHEET: pH and Water Lab Lab Instructor: ______________________ Lab Day & Time: _______________ Student name(s): _________________________________________________________ DATA AND ANALYSIS Substance PH
Distilled water 7
Sugar Water 7
Orange Juice 3.9
Regular soda
2.5-3.5
Diet soda
3.70
Flat soda
4.03
Scouring cleanser 10.5
Tomato juice
4.1-4.3
Carbonated Water
4.18-5.87
Apple juice
3.48-3.69
Beer
14
Wine 2.9
Coffee
4.85-5.10
Tea
4.9-5.5
Drain cleaner 12-14
Window cleaner 8-11
Alkaline water 8-9
Dish soap
7-10
Bleach Solution
11-13
Antacid
8.5-10.5
Lemon juice
2-3
Ammonia solution
11-12
pH balanced shampoo
4.5-7
Houseland cleaner 9-11
Laundry Detergent 7-10
Exercise II: Buffer Experiment.
Read instructions on p. 15 Buffers
and slides #14-16 of the pH/Water lab PowerPoint pdf file in the Lab 2. pH
and Water Lab Due 2/23 folder. The results of the experiment are as follow:
Buffer Solution
Initial pH
pH After Adding Acid
pH After Adding Base
Tap water
___7.5____ ___4.0____ ___12.0____
____7.0___ ___6.5____ ___7.0____
Answer questions on p. 22.
1. Is a solution with a "low" pH acidic or basic? Yes 2. Which is more concentrated in a "high" pH solution, H+or OH -? The OH- is more concentrated because the H+ decreases the higher the pH gets. 3. Are the reactive qualities of window cleaner due to an excess of H+ or an excess of OH -? H+
4. Which has more hydrogen ions, wine or water?
wine
5. Vinegar is an acetic acid solution. Does its pH agree with this fact (yes or no)? yes
6. Do soaps and cleaners tend to be acidic or basic? basic
Milk
7. Did the H+ concentration of diet soda and regular soda differ by a magnitude of 10 times or greater (yes or no)? yes
8. Did the H+ concentration of pure water and sugar water differ by a magnitude of 10 times or greater (yes or no)? yes 9. Did the H + concentration of fresh soda pop and flat soda pop differ by a magnitude of 10 times or greater (yes or no)? yes
10. From questions 7, 8, & 9, would you conclude that the pH of soda pop is strongly influenced by: 1) sugar, 2) carbonation, 3) both, or 4) neither? both
11. How many times more basic is a solution with a pH of 9 than a solution with a pH of 8 (2, 10, 20, 100, or 200)? 10
12. How many times more basic is a solution with a pH of 10 than a solution with a pH of 8 (2, 10, 20, 100, or 200)? 100
13. Did your experimental results agree with the fact that milk is a pH buffer? Yes
14. Did the milk buffer: 1) acid, 2) base, or 3) both in your experiment? Yes
15. Which heats more slowly, ethyl alcohol or water? Ethyl
16. Which cools more slowly, ethyl alcohol or water? Alcohol
17. Which has the higher specific heat, ethyl alcohol or water? Water 18. If your blood and tissue fluid were alcohol instead of water, would you be more likely to get overheated on a hot day, (yes or no)? Yes 19. Assuming organisms function best if their internal temperatures remain relatively constant as outside temperatures change, would a body fluid with a high or low specific heat best? low 20. Palm Springs is almost directly inland from Santa Monica. Which of these places has more water nearby and in the air?
Santa Monica 21. Which of these places, Palm Springs or Santa Monica, experiences both hotter and colder temperatures? Palm Springs 22. Other factors being equal, should a humid or dry night get colder? Humid Heat of Vaporization 23. Would death by "drying up" be more likely for an organism composed of alcohol or for one (like us) composed of water? Alcohol 24. Based on the behavior of water with wax, oil, and most plastics, would you say that these substances are polar or nonpolar? Nonpolar 25. Does water hold other ions (such as sodium or chloride) in solution by adhesion or cohesion? Adhesion 26. For the most capillary action to occur, is it necessary for: 1) only the fluid, or 2) both the fluid and the tube to be polar? Both
27. Do your experimental results suggest that a tree could move water more effectively from its roots to its leaves using smaller- or larger- diameter vessels? Smaller 28. Mosquitoes can walk on the surface of water because of adhesion or
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Related Questions
board
Instructions
Please select the best answer for each of the questions.
This test has a time limit of 2 hours.This test will save and submit automatically when the time expires.
Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain.
Timed Test
Multiple Attempts Not allowed. This test can only be taken once.
Force Completion Once started, this test must be completed in one sitting. Do not leave the test before clicking Save and Submit
This test does not allow backtracking. Changes to the answer after submission are prohibited.
Your answers are saved automatically.
Remaining Time: 1 hour, 34 minutes, 00 seconds.
* Question Completion Status:
A Moving to the next question prevents changes to this answer.
Question 2
What is the pH of the solution which results from mixing 25 mL of 0.20 M CH3CO>H and 25 mL of 0.20 M NAOH? (K, for CH3CO>H = 1.8 x 10-b)
OA 8.87
OB. 10.43
OC7.00
OD.9 02
OE 5.13
A Moving to the next question prevents changes to this answer.
*-
F11…
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Introduction
Background research information about the
lab/lab topic. Use internet sites to research
antacid tablets and how they work.
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Which of the following are hazards in this lab? Choose all that apply.
Group of answer choices
NaOH
HCl
NH3
acetic acid
deionized water
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Health Science Question:
Answer in 15 minutes no more than that-
Answer correctly and read the question correctly, I do not need an explanation to why these are the correct answer, I just would like the key answer please and thank you. If the question is done correctly, I will write a very wonderful and long review about you!
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Write the balanced equation for the neutralization of acid rain (assume HNO3 is dissolved in water) by limestone (calcium carbonate).
Express your answer as a chemical equation.
ΑΣφ
?
DA chemical reaction does not occur for this question.
Submit
Request Answer
Provide Feedback
76
tv
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This question must be finished in your tutorial and this Word document containing your answers
submitted within 120 minutes of the end of your tutorial. You will receive feedback from your tutor
in a few weeks. The answers will be available where you obtained this. There are no marks for this
exercise but it counts towards participation.
Draw your answers on a separate piece of paper, take an image and insert the image(s) into this
Word document at the end.
(a)
Re-draw the following molecule with the CH2CH2CH3 group on the ladder
1.
H
H2
ОН
H3C
H2
CH2
H;C
(b)
Is the molecule in part (a) the same molecule or the enantiomer of the following.
Circle your answer
Explain your answer
CH3
SAME MOLECULE
H2C
H2
-CH3
ENANTIOMER
H2
ОН
3.
What is the configuration (R or S) of the chiral carbon in this molecule.
Label the ranking of each of the groups on the chiral carbon from 1 (highest) to 4 (lowest)
Draw the representation of this molecule with the lowest ranked group (4) on the ladder and…
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Please answer questions as they are calculated together but just a heads up they are different questions. Thank you for helping me
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sure your internet connection is working well. Interrupted service can be used as a reason for a retake,
only have one attempt. There are no retakes.
ot click the "Back" button on your web browser it will kick you out of the exam.
e: Make sure to answer all questions. If you close the exam early with answering all questions in your exam.
wers that you answered will count as your completed exam and all questions not answered will be marked
Question 1
Which of the following best explains why soap and water remove grease?
O Soap molecules are large polymers that absorb grease
O Soap molecules are ionic and attracted to grease
Soap molecules are nonpolar and dissolve in grease
O Soap molecules have ionic "heads" that dissolve in water and nonpolar "tails" that dissolve in water
O Soap molecules have ionic "heads" that dissolve in grease and nonpolar "tails" that dissolve in water.
Quiz saved at 6:52p
ch
O O
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urses/55527/quizzes/401369/take
→
#
3
Complete the data table using the calculation process you used to complete
the previous question.
Be sure to keep a copy of the completed table to include in the lab report for
this experiment.
$
Trial
1
Trial
2
Trial
3
Trial
4
Trial
5
4
1.00 M Acetic Acid
volume
HC₂H3O2
25.0 mL
25.0 mL
25.0 mL
25.0 mL
25.0 mL
Q Search
f5
%
moles
5
f6
Mole
Ratio
6
HC₂H3O2
: NaHCO3
3:1
2:1
*All values should contain three (3) significant digits.
1:1
1:2
1:3
U
hp
NaHCO3
Molar Mass: 84.007 g/mol
moles
fg
*
99+
8
a
fg
mass needed
DO
9
f10
► 11
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2- Lab Report
1 Post-Lab
Part A
How could you distinguish solution of sodium chloride (table salt) from a solution of sodium iodide (a poison) using an AgNO3 solution? Show reactions.
Express your answers as balanced chemical equations. Identify all of the phases in your answer. Seperate the two equations by a comma.
> View Available Hint(s)
Submit
Request Answer
Part B Complete previous part(s)
Provide Feedback
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Topic: Test of cation and anion.(qualitative) for each question right 4/5 bullet points
1. How this topic is related to Environmental science / bioinformatics? Choose 1
2. How this topic is related to our real life / industry? Choose one
3. Recent research and development of this topic.
At least 4 bullet point each question, It will be very helpful for me .Thank you in advance .
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Sea X
Assignments: ANATO X Gi
0220907135028396%20(1).pdf
2
CD Page view
Human Anatomy X
A Read aloud
*20220907135028396 X
TAdd text
Draw
4 You prepare four solutions:
Solution 1: Reactants + enzyme at #0 (about 100°F) and pH 7
Chemistry
Check your recall lab. x
V
Highlight
UNIT 2 65
3 Decompression sickness (also known as the bends) is a condition that affects divers and others operating under
pressurized conditions. It occurs when gases such as nitrogen (N₂) come out of solution in the blood. This can
lead to symptoms including joint pain, shortness of breath, and paralysis. Severe cases may result in death.
a What type of molecule (ionic, polar covalent, nonpolar covalent) is nitrogen gas?
b The liquid medium of blood is water. What type of compound (ionic, polar covalent, nonpolar covalent) is
water?
c What happens when molecules such as nitrogen gas mix with water? How does this explain the problems we
see with decompression sickness?
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>
1
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this is my chem homework. i can’t find the answer key. please help. thank you
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You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc.
The lab will analyze large samples for Cu. What instrument would you recommend purchasing to support this work, Atomic absorption spectrophotometer or an inductively coupled plasma atomic spectrophotometer? Explain the basis for your decision.
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Need help with number 4.
Theses are pre lab questions and not homework. Was rejected once and unsure why. Pre lab means before the actually lab we do (which that part is graded)
Thanks
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Using the lab instructions and data table with data, please help me complete part 1 and 2 of my lab worksheet
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I need help with these
(Not honor class)
*the second picture is another one part of the question
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HELP PLEASE if someone or anyone could help on any of these questions you will literally be my life saver.
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hi please help me with this problem need it until 9:06 am thank you. Kindly please make it short, not long. thank you soo much
fROM THE PICTURE (A) Write down 10 hazards that you can observe in the said picture. (B) Identify the type or category of hazard (physical, chemical, microbiological, allergenic) that you observed and write its category beside the name of the corresponding hazard. To facilitate the checking of your answers, number them accordingly (1 to 10). Example: 1. nail - physical *
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Which of the following describes a gradient elution process?
stationary phase has varying concentration
mobile phase has varying concentration
stationary phase has static concentration
mobile phase has static concentration
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Fill the table .
This question is complete .
If you don't know the answer then leave it for other experts. Choose "insufficient subject knowledge" option while skipping.
Warning : if you choose any other option while skipping , i will report your expert account. Your account will get revoked soon.
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concept that seemed difficult to you at first, but then after working on the concept, you were able to master it. Include a description of what made the concept difficult at first, and then discuss what you did in order to better understand the concept.
If you are not familiar with The Onion, it's a satirical newspaper. That "NSF: Science Hard" article pictured above came out while one of my colleagues was in college. She said that it made her laugh so hard because she was in the middle of a very hard time analyzing data. But, She made it through. And you can make it through this course!
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Posttest
Direction. Read the questions carefully. Write the letter of the correct answer.
1. Water exists in three states of matter and continuously moving through a cycle
on Earth. At which stage in the water cycle does water transform from a gas to a
liquid?
a.evaporation
c. precipitation
b. condensation
d. Sublimation
2.
Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which
of the following is the BEST evidence that a chemical reaction occurs when the coal
burns?
a. Production of mechanical energy c. A new substance is produced
b. Production of electricity
d. Formation of precipitate
3.Which of these does NOT happen during a chemical change?
a. New substances are formed with different chemical properties.
b. Attractive force between atoms of molecule formed or break.
c. The chemical properties of the substances before and after the reaction are
the same
d. Energy is always released or absorbed.
4. A granular substance is added to a liquid. Which of the…
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Which of the following describes a gradient elution process?
stationary phase has varying concentration
stationary phase has static concentration
mobile phase has varying concentration
mobile phase has static concentration
arrow_forward
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- board Instructions Please select the best answer for each of the questions. This test has a time limit of 2 hours.This test will save and submit automatically when the time expires. Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain. Timed Test Multiple Attempts Not allowed. This test can only be taken once. Force Completion Once started, this test must be completed in one sitting. Do not leave the test before clicking Save and Submit This test does not allow backtracking. Changes to the answer after submission are prohibited. Your answers are saved automatically. Remaining Time: 1 hour, 34 minutes, 00 seconds. * Question Completion Status: A Moving to the next question prevents changes to this answer. Question 2 What is the pH of the solution which results from mixing 25 mL of 0.20 M CH3CO>H and 25 mL of 0.20 M NAOH? (K, for CH3CO>H = 1.8 x 10-b) OA 8.87 OB. 10.43 OC7.00 OD.9 02 OE 5.13 A Moving to the next question prevents changes to this answer. *- F11…arrow_forwardIntroduction Background research information about the lab/lab topic. Use internet sites to research antacid tablets and how they work.arrow_forwardWhich of the following are hazards in this lab? Choose all that apply. Group of answer choices NaOH HCl NH3 acetic acid deionized waterarrow_forward
- Health Science Question: Answer in 15 minutes no more than that- Answer correctly and read the question correctly, I do not need an explanation to why these are the correct answer, I just would like the key answer please and thank you. If the question is done correctly, I will write a very wonderful and long review about you!arrow_forwardWrite the balanced equation for the neutralization of acid rain (assume HNO3 is dissolved in water) by limestone (calcium carbonate). Express your answer as a chemical equation. ΑΣφ ? DA chemical reaction does not occur for this question. Submit Request Answer Provide Feedback 76 tvarrow_forwardThis question must be finished in your tutorial and this Word document containing your answers submitted within 120 minutes of the end of your tutorial. You will receive feedback from your tutor in a few weeks. The answers will be available where you obtained this. There are no marks for this exercise but it counts towards participation. Draw your answers on a separate piece of paper, take an image and insert the image(s) into this Word document at the end. (a) Re-draw the following molecule with the CH2CH2CH3 group on the ladder 1. H H2 ОН H3C H2 CH2 H;C (b) Is the molecule in part (a) the same molecule or the enantiomer of the following. Circle your answer Explain your answer CH3 SAME MOLECULE H2C H2 -CH3 ENANTIOMER H2 ОН 3. What is the configuration (R or S) of the chiral carbon in this molecule. Label the ranking of each of the groups on the chiral carbon from 1 (highest) to 4 (lowest) Draw the representation of this molecule with the lowest ranked group (4) on the ladder and…arrow_forward
- Please answer questions as they are calculated together but just a heads up they are different questions. Thank you for helping mearrow_forwardsure your internet connection is working well. Interrupted service can be used as a reason for a retake, only have one attempt. There are no retakes. ot click the "Back" button on your web browser it will kick you out of the exam. e: Make sure to answer all questions. If you close the exam early with answering all questions in your exam. wers that you answered will count as your completed exam and all questions not answered will be marked Question 1 Which of the following best explains why soap and water remove grease? O Soap molecules are large polymers that absorb grease O Soap molecules are ionic and attracted to grease Soap molecules are nonpolar and dissolve in grease O Soap molecules have ionic "heads" that dissolve in water and nonpolar "tails" that dissolve in water O Soap molecules have ionic "heads" that dissolve in grease and nonpolar "tails" that dissolve in water. Quiz saved at 6:52p ch O Oarrow_forwardurses/55527/quizzes/401369/take → # 3 Complete the data table using the calculation process you used to complete the previous question. Be sure to keep a copy of the completed table to include in the lab report for this experiment. $ Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 4 1.00 M Acetic Acid volume HC₂H3O2 25.0 mL 25.0 mL 25.0 mL 25.0 mL 25.0 mL Q Search f5 % moles 5 f6 Mole Ratio 6 HC₂H3O2 : NaHCO3 3:1 2:1 *All values should contain three (3) significant digits. 1:1 1:2 1:3 U hp NaHCO3 Molar Mass: 84.007 g/mol moles fg * 99+ 8 a fg mass needed DO 9 f10 ► 11arrow_forward
- 2- Lab Report 1 Post-Lab Part A How could you distinguish solution of sodium chloride (table salt) from a solution of sodium iodide (a poison) using an AgNO3 solution? Show reactions. Express your answers as balanced chemical equations. Identify all of the phases in your answer. Seperate the two equations by a comma. > View Available Hint(s) Submit Request Answer Part B Complete previous part(s) Provide Feedbackarrow_forwardTopic: Test of cation and anion.(qualitative) for each question right 4/5 bullet points 1. How this topic is related to Environmental science / bioinformatics? Choose 1 2. How this topic is related to our real life / industry? Choose one 3. Recent research and development of this topic. At least 4 bullet point each question, It will be very helpful for me .Thank you in advance .arrow_forwardSea X Assignments: ANATO X Gi 0220907135028396%20(1).pdf 2 CD Page view Human Anatomy X A Read aloud *20220907135028396 X TAdd text Draw 4 You prepare four solutions: Solution 1: Reactants + enzyme at #0 (about 100°F) and pH 7 Chemistry Check your recall lab. x V Highlight UNIT 2 65 3 Decompression sickness (also known as the bends) is a condition that affects divers and others operating under pressurized conditions. It occurs when gases such as nitrogen (N₂) come out of solution in the blood. This can lead to symptoms including joint pain, shortness of breath, and paralysis. Severe cases may result in death. a What type of molecule (ionic, polar covalent, nonpolar covalent) is nitrogen gas? b The liquid medium of blood is water. What type of compound (ionic, polar covalent, nonpolar covalent) is water? c What happens when molecules such as nitrogen gas mix with water? How does this explain the problems we see with decompression sickness?arrow_forward
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