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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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180 degrees
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109 degree
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A. Complete the row for MgSO4MgSO4.
Enter your answers numerically separated by a comma.
B. Complete the row for NaOHNaOH.
Enter your answers numerically separated by a comma.
C.
Complete the row for CH3OHCH3OH.
Enter your answers numerically separated by a comma.
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V. Error Analysis/Questions For the following questions explain what specific error in calculating your Ksp value would occur (i.e. would the Ksp be too HIGH or too LOW), compared to the situation in which no errors occur. When you answer the question, consider how the situation affects the calculation of Ksp. Each answer must have an explanation and type the answer, please.
A. The buret was not conditioned (it still had water in it) when you add the HCl. Would the Ksp be too HIGH or too LOW?
B. There was Ca(OH)2 solid (that was not filtered off) in your solution to be titrated. Would the Ksp be too HIGH or too LOW?
C. You measured 24.00 mL of Ca(OH)2 solution instead of 25.00 mL. Would the Ksp be too HIGH or too LOW?
D. The HCl concentration was actually lower than the reported molarity on the bottle. Would the Ksp be too HIGH or too LOW?
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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
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g of malachite were originally used.
Chemistry I (Science Majors) (CHEM-141...
Ć
Malachite is a green copper mineral with the formula Cu₂CO3(OH)2. It can be converted into copper metal in a number of ways. One
method extracts the metal by reacting the malachite with sulfuric acid to form CuSO4, and then adding iron to the CuSO4 solution
which, after they react, forms FeSO4 and copper metal. The balanced chemical reactions are:
Cu₂CO3(OH)2 (s) + 2 H₂SO4 (aq) →2 CuSO4 (aq) + 3 H₂O (1) + CO₂ (g)
CuSO4 (aq) + Fe (s) →FeSO4 (aq) + Cu (s)
If the final solution is dried, and 3.28 g of iron sulfate is collected, how many grams of malachite were originally used?
W Wiley Course Resources
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CHEMICAL REACTIONS
Solving for a reactant using a chemical equation
3/5
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.
g
x10
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Explanation
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[References)
Use the References to access important values if needed for this question.
Write the Ksp expression for the sparingly soluble compound silver cyanide, AgCN.
If either the numerator or denominator is 1, please enter 1.
Ksp
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Complete the Post-lab for Lab 10 - Kinetics after completing the laboratory exercise. This post-lab is due before the beginning of the next lab meeting.
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The lodine Clock Reaction where the solution turns blue-black at the end was the experiment performed three times in this lab to investigate the effect of concentration on
rate of reaction.
The experiment was then repeated for a fourth trial. The concentration of the H2O2 was decreased to 0.375 % and the concentration of Solution A kept the same as the three
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3. Reactions that occur in the gaseous state are affected by changing the volume of
the container. Which choice best describes what will happen to the reaction if the
volume of the container is decreased?
The reaction will speed up.
The reaction will shift left.
The reaction will not change.
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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_forwardJust give me the last step solutions(make the solution shortest) and give me the answer. Thank you.arrow_forward
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