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Activities and Explorations: 10 points, Due Sunday Feb. 26, 11:59 PM
Claim, Evidence, Reasoning:
Buffers
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Learning Objectives
16.3 Buffer Solutions
Define a buffer.
Predict the relative pH change for a given buffer system after addition of
strong acid or strong base.
Instructions:
Work through the experiment below and determine which of the solution(s)
might be a buffer based upon the experimental data.
Imagine you have 50 mL of each of three solutions labeled A, B, C and you go about
carrying out the following experiments to determine which of the solutions possibly are
buffers.
The experimental set up for the test tubes is shown in Table 1 below and the
data gathered is in Table 2.
Table 1: Experimental Set Up.
Experimental procedure Part I
Experimental procedure Part II
1.
Remove 5 mL of each solution and
place it in a test tube and measure
the pH.
Data is recorded in Table 2
below.
3.
Obtain 3 new clean test tubes.
Remove 5 mL of each solution and
place it in a test tube.
2.
Add a small amount, 4-5 drops, of
0.001 M HCl to each test tube and
measure the pH.
The results are
shown in the Table 2.
4.
Add a small amount, 4-5 drops, of
0.001 M NaOH to each test tube and
measure the pH.
The results are
shown in the Table 2.
Table 2: Experimental Data for each Solution (A, B, and C).
Solution
A
B
C
Measured pH of 5 mL sample (step 1)
3.56
9.98
7.00
pH after addition of HCl (step 2)
3.48
9.90
1.63
pH after addition of NaOH (step 4)
3.64
10.08
12.30
A
C
B
1.
Which solution or solutions are buffers (this is your claim)?
A and B are the buffers due to the fact that they barely changed.
2.
Justify and explain your answer to #1 using the data in the table above and the
definition of a buffer. (You must include the definition of a buffer in your
response!)
Buffers can be defined as solutions that don’t change when acids or bases are
added. Based upon the chart you can see that solution A and B stayed mostly
consistent while exposed to both HCl which is an acid and NaOH which is a
base. Compared to solution C which has a drastic change when exposed to the
acids and bases.
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Question 18
Consider the following reaction mechanism:
CH3OH(ag) + H*(ag) – CH3OH2*(ag)
CH;OH2*(ag) + Br(ag) → CH3Br(ag) + H2O(1)
Identify each species appropriately from the list below.
Question 18 options:
CH;Br(ag)
CH;OH(ag)
1.
reactant
H2O(1)
2.
product
H*(ag)
3.
intermediate
Br(ag)
4.
catalyst
CH;OH2*(ag)
Question 19
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Name:
Lab Section (Day & Time):
3361L
Molecular Modeling and Stereochemistry Worksheet
CHEM
Ground Rules:
1. You are required to build models for various tasks presented in this exercise. Molecular modeling programs are not
a substitute for 3-D hand-held molecular models.
2. You will be prompted to include a snapshot of your model with each task at the end of this worksheet. Read the
question carefully to construct and orient the models appropriately. Use your smartphone to take a picture of the
model you build, and insert it at the end of the handout with corresponding prompts. You will not get any credit for
this assignment without correct snapshots of the models you build.
3. Hand-write your responses for each task and insert the snapshots for various models at the end of this docuent. Save
the entire assignment as a single PDF. A consolidated PDF of the completed assignment (including relevant snapshots
of your models should be submitted…
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Compare the rates of change at the different
points of the pH scale.
a) Does adding two to a pH at one end of the
scale (going from a pH of 1 to 3) have the same
effect as adding two to a pH at the other end of
the scale (going from a pH of 10 to 12)?
Support your conclusions.
b) Does doubling the pH from 2 to 4 have the
same effect has doubling the pH from 5 to 10?
Support your conclusions?
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Georgian
Q49 (Ex. 13.6) In chemistry, the pH value .. measure.. acidity. The pH value is defined by pH = – log(H*)
where H*is the hydrogen-ion concentration (in mol/L). If the pH of rainwater is 4.764, find the hydrogen-
ion concentration. (If pH 7, solution is basic.)
SOLVING EXPONENTIAL EQUATIONS
To solve...
1. Isolate...
2. Then do ...
(?) = log(number) or
(?) = In(number) or
(?) = loga(number)
10?) = (number)
e(?)
= (number)
a(?) = (number)
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Chapter 3 HW
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nity College - CHEM 111 - Summer21 - WILSON > Activities and Due Dates > chapter 3 HW
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Assignment Score:
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In the given depiction of a substance, each sphere
represents a chlorine atom.
What is the formula of this substance?
O = CI
chemical formula:
CI.
Incorrect
What is the state of matter of this substance?
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Veek 6 Homework # 6
Week 6 Homework
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MISSED THIS? Watch KCV 11.9; Read Section 11.9. You can click on the Review link to access the section in your e Text.
The hydrogen gas formed in a chemical reaction is collected over water at 30 °C at a total pressure of 732 mm Hg . The vapor pressure
of water at 30 °C is 31.8 mm Hg.
deos
Part A
What is the partial pressure of the hydrogen gas collected in this way?
Express your answer in millimeters of mercury to three significant figures.
tions
PH,
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CHEMICAL REACTIONS
Solving for a reactant using a chemical equation
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Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H₂O) and carbon dioxide (CO₂)
chemically react to form the simple sugar glucose (C6H₁2O6) and oxygen gas (0₂).
12
What mass of carbon dioxide is consumed by the reaction of 3.6 g of water?
Be sure your answer has the correct number of significant digits.
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1. Find the average reaction time for each experiment. Show your work for experiment 1.
Experiment Average Reaction Time (s)
1.
2.
3.
2. Calculate concentrations after mixing and then calculate the reaction rate. Show your
work for experiment 1 (more space for this on next page). NOTE: These are your
starting concentrations for the reaction.
[HSO;] (M)
Reaction Rate (M/s)
Experiment
[10,] (M)
1.
2.
3.
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QUESTION 24
In the experiment "Beer-Lambert's Law and Spectrophotometry", you prepared a calibration plot similar to the one
pictured below. What is the approximate concentration of a solution whose absorbance is 0.35?
Calibration Plot
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.
0.01
0.02
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0.05
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- W AutoSave O Search (Alt+Q) Off ASSIGNMENT 24.docx - raghav grover RG File Home Insert Draw Design Layout References Mailings Review View Help P Comments A Share O Find Lato v 18 - A A Aa v A No Spacing Heading 1 Heading : E Replace Normal Paste I U ab x, x A - Dictate Editor Reuse A Select v Files Undo Clipboard Font Paragraph Styles Editing Voice Editor Reuse Files Question 18 Consider the following reaction mechanism: CH3OH(ag) + H*(ag) – CH3OH2*(ag) CH;OH2*(ag) + Br(ag) → CH3Br(ag) + H2O(1) Identify each species appropriately from the list below. Question 18 options: CH;Br(ag) CH;OH(ag) 1. reactant H2O(1) 2. product H*(ag) 3. intermediate Br(ag) 4. catalyst CH;OH2*(ag) Question 19 * Accessibility: Investigate D'Focus 0% 11 Page 2 of 16 1271 words English (Canada) ENG 4:32 PM O Type here to search 0°C Sunny W US 2022-04-26 11 近arrow_forwardsend asap plsss answer needed!!arrow_forwardPlease look at the image attached Please please please answer everything super super fastarrow_forward
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