CHEM 110 determining Ka for pH indicators
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Economics
Date
May 13, 2024
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5
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Experiment 6
Determining Ka for pH Indicator
Total Points: 67
Student’s Name:
Parker Gould
Lab Section: 503
Your report must include the following:
-
Data Tables 1 and 2
-
Copies of the information you posted on Canvas (both the titration curve and data
table summary)
-
Section Results Tables 1 and 2
-
Post-lab Questions
NOTE: You must show your work for all calculations; no work, no credit.
Data Table 1 (5 pts)
Buret Reading
(mL)
pH
Buret Reading
(mL)
pH
0.0
4.90
15.0
8.59
0.5
4.96
15.5
8.74
1.0
4.99
16.0
8.88
1.5
5.02
16.5
8.96
2.0
5.08
17.0
9.04
2.5
5.15
17.5
9.06
3.0
5.20
18.0
9.13
3.5
5.28
18.5
9.15
4.0
5.33
19.0
9.18
4.5
5.45
19.5
9.19
5.0
5.53
20.0
9.22
5.5
5.62
20.5
9.20
6.0
5.72
21.0
9.22
6.5
5.79
21.5
9.23
7.0
5.89
22.0
9.23
7.5
6.0
22.5
9.24
8.0
6.06
23.0
9.27
8.5
6.15
23.5
9.20
9.0
6.25
24.0
9.31
9.5
6.33
24.5
9.32
10.0
6.42
25.0
9.33
10.5
6.51
25.5
9.36
11.0
6.60
26.0
9.37
11.5
6.73
26.5
9.38
12.0
6.85
27.0
9.38
12.5
7.13
27.5
9.39
13.0
7.36
28.0
9.40
13.5
7.65
28.5
9.41
Experiment 6
Determining Ka for pH Indicator
Total Points: 67
14.0
7.98
29.0
9.42
14.5
8.25
29.5
9.43
30.0
9.44
Data Table 2 (10 pts)
pH
Absorbance
Determined K
a
Explanation if K
a
NOT Included in Average
8.24
0.638
6.67
0.435
3.7x10^-7
5.35
0.211
2.2x10^-6
4.37
0.144
1.2x10^-5
4.04
0.090
1.5x10^-5
3.90
0.089
2.0x10^-5
3.76
0.074
2.3x10^-5
3.67
0.065
2.4x10^-5
3.66
0.044
1.6x10^-5
Data Outlier Qcalc > Qtable = 0.512>0.376
Average K
a
(3 pts)
→
1.4x10^-5
Show Q test calculation if any test performed and include a justification for why you used the Q test of
why you did not use the Q test (5 pts): data point did not correlate with the trend of the data points.
Ka= [10^-pH](A) / (Aref-A)
10^-6.67 (0.435) / (0.638-0.435) = 3.7x10^-7
Gap= 2.2x10^-6 - 3.7x10^-7 = 1.83x10^-6
2.4x10^-5 - 1.6x10^-5 = 8.0x10^-6 (Bigger)
8.0x10^-6 / (1.6x10^-5 - 3.7x10^-7) = 0.512
Qcalc > Qtable —> 0.512>0.376
Experiment 6
Determining Ka for pH Indicator
Total Points: 67
Section Results Table 1 – Titration Curve Method
In the table below, enter at K
a
values determined by the titration method from all groups in your lab
section. Calculate the overall average K
a
.
Determined K
a
– Titration Method (5 pts)
Explanation If Determined K
a
Excluded from
Average
7.76x10^-7
1.62x10^-6
1.82x10^-6
2.69x10^-6
4.90x10^-6
5.50x10^-5
Data seems to be skewed resulting in the wrong
type of curve in the graph
Qcalc> Qtable
Average K
a
– Titration Method (3 pts)
2.36x10^-6
Show work if Q test performed and include a justification for why you used the Q test or why you did not
use the Q test (5 pts):
Gap= 1.62x10^-6 - 7.76x10^-7 = 8.44x10^-7
5.50x10^-5 - 4.90x10^-6 = 5.01x10^-5 (bigger)
5.01x10^-5 / (55.50x10^-5 - 7.76x10^-7) = 0.924
Qcalc>Qtable
Section Results Table 2 – Spectrophotometric Method
In the table below, enter all
average
K
a
values determined by the spectrophotometric method from all
groups in your lab section. Calculate the overall average K
a
.
Determined Average Ka – Spectrophotometric Method (5 pts)
1.4x10^-5
0.024
1.11x10^-5
6.37x10^-6
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- (look at the attached image) a. Explain whether the specification uses a pre-post or a simple difference method? Discuss the counterfactual in the specification above. b. Using the specification above, discuss whether you would be able to estimate an unbiased estimate on the effect of BSM on students' test scoresarrow_forwardAdditional Problems: need letter D and #2 1. Respond to all parts of the following problem (this is a sample test question) – you only need a sentence where one is specifically requested. The parts here correspond to the parts in the annotated example.The American Community Survey collects income information in the US. In 2015 persons aged 25 and over with a Bachelor’s degree had annual median earnings of $50,595, while in 2017reported annual median earnings at this level of education was $52,019.a) Find the relative change in annual median earnings for persons aged 25 and over with a Bachelor’s degree between 2015 and 2017. Round your answer to the nearest .1%.b) Find the rate of inflation from 2015 to 2017, rounded to the nearest .1%.c) Meaningfully compare the percent increase in annual median earnings for persons aged 25 and over with a Bachelor’s degree to the rate of inflation between 2015 and 2017. Respond with a well written contextual sentence directed to a general audience…arrow_forwardAn investigator will be studying nutrition among Latina women. To find participants to interview, she requested a list of names and contact information for all Latina women from a community clinic. These women had already provided consent and had agreed to be contacted about participating in future research studies. The list included 1,000 names of potential participants for the nutrition study. The investigator chose 200 of the women from this list to contact for possible inclusion in the study. D3 Question: Do the women included on this list represent the larger group?arrow_forward
- xt:Bong-Cha is deciding what to do during the 30-minute break between her college classes. One rule she could follow is, "Choose the activity with the highest value" (A). Another rule she could follow is, "Choose the activity with the lowest opportunity cost" (B). Do you think Bong-Cha's choice if she follows rule (A) will be the same as the choice she would make if she followed rule (B)? [another way to think about it, "Is rule (A) identical to rule (B) in a sense that they would both induce the same choice?"].arrow_forwardPlease note that this question has not yet been graded. Each time I try submitting this question for help I always get feedback that it cannot be answered due to already being graded. It has not yet been graded, thank you.arrow_forwardSuppose that the repeated application of a pesticide used on orange trees causes harmful contamination of groundwater. The pesticide is applied annually in almost all of the orange groves throughout the world. Most orange growers regard the pesticide as a key input in their production of oranges. Note:- Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. Answer completely. You will get up vote for sure.arrow_forward
- This question is intended to have a written response given. The writtenresponse should be 2-3 paragraphs maximum and focused on answer the specific questions of interest using the tools/concepts from lecture/tutorials. You may include agraph to support your argument/ideas, but this is not required (note: I would recommend you sketch a graph when thinking about how to answer this question, thoughthat does not need to be submitted). Leung and Seo wrote an article “How do government transfer payments affect retail prices and welfare? Evidence from SNAP” (Jan,2023) in the Journal of Public Economics. To answer this question, you do not need togo read the paper. I would in fact recommend against it as the paper is very technicaland assumes a knowledge of statistics that most students taking Econ 201 will nothave (some of the ideas will be discussed in Econ 233 and Econ 333). We will use theinformation/main ideas as a starting framework.In the United States, one of the largest welfare…arrow_forwardQuestion 2 D- i),ii) and iii)arrow_forwardBased on picture: 1. Explain questionnaire design. 2. Explain the questionnaire layout. 3. Explain the measurements scale include the use rating scale techniques of category scale for section A and likert scale for section B, C, D and E.arrow_forward
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