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CHEM182DL1_Beer39sLaw_48408.pdf

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Student Name

Mohammed Alnaimi

Student ID 48408 Lesson Beer's Law Institution Ocean County College Session 2019L3 CHEM 182 DL1 Course CHEM 182 DL1 Instructor Nancy Marashi

Final Report

Exercise 1 Data Table 1: Concentration and Resistance

CHEM 182 DL1 Beer's Law

Test Tube Concentration of Red Dye in Test Tube (M)

B 0.000199

CD 1

2.15 x 10^-4

1.59 x 10^-4

1.39 x 10^-4

1.19 x 10^-4

9.95 x 10^-5

7.96 x 10^-5

5.97 x 10^-5

3.98 x 10^-5

1.99 x 10^-5

CD 2

W 0

Test Tube Resistance for W Blank (Ω)

CD 1

CD 2

Test Tube Resistance for Sample (Ω)

5.02 x 10^3(Ω)

4.65 x 10^3

6.28 x 10^3

7.19 x 10^3

8.403 x 10^4

1.005 x 10^4

1.256 x 10^4

1.675 x 10^4

2.51 x 10^4

5.02 x 10^4

5.02 x 10^3

5.02 x 10^4

5.02 x 10^3

6.23 x 10^3

6.25 x 10^3

7.19 x 10^3

CD 1

CD 2

Test Tube Overall Resistance

8.10 x 10^4

1.00 x 10^4

1.25 x 10^4

1.67 x 10^4

2.51 x 10^4

5.02 x 10^4

1.33

0.99

0.96

Data Table 2: Concentration and % Transmittance

CD 1

CD 2

Test Tube Concentration of Red Dye in Test Tube (M)

B 0.000199

W 0

CD 1

CD 2

Test Tube Resistance for W Blank (Ω)

2.15 x 10^-4

1.59 x 10^-4

1.39 x 10^-4

1.19 x 10^-4

9.95 x 10^-5

7.96 x 10^-5

5.97 x 10^-5

3.98 x 10^-5

1.99 x 10^-4

5.02 x 10^-3

CD 1

CD 2

Test Tube Resistance for Sample (Ω)

5.02 x 10^-3

5.02 x 10^3

6.23 x 10^3

6.25 x 10^3

7.19 x 10^3

8.40 x 10^3

1.00 x 10^4

1.25 x 10^4

1.67 x 10^4

CD 1

CD 2

Test Tube Current for W Blank (A)

CD 1

CD 2

Test Tube Current for Sample (A)

2.51 x 10^4

5.02 x 10^-3

CD 1

CD 2

Test Tube Percent Transmittance (%T)

5.02 x 10^-3

6.23 x 10^-3

6.25 x 10^-3

7.19 x 10^-3

8.40 x 10^-3

1.00 x 10^-2

1.25 x 10^-2

1.67 x 10^-2

5.02 x 10^-3

100

80.57

80.47

69.86

59.79

50.23

Data Table 3: Concentration and Absorbance

CD 1

CD 2

30.07

31.31

100

Test Tube Concentration of Red Dye in Test Tube (M)

B 0.000199

W 0

2.15 x 10-4

1.59 x 10-4

1.39 x 10-4

1.19 x 10-4

9.95 x 10-5

7.96 x 10-5

5.97 x 105

3.98 x 10-5

1.99 x 10-4

Exercise 2

CD1

CD2

Test Tube Absorbance

CD1

CD2

1.99 x 10-4

100

80.57

80.47

69.86

59.79

50.23

30.07

31.31

100

Possible sources of error would be spilling of any substance to which would alter the outcome of each experiment, lack of attention to t ime and chemical reaction registration, as well as the use of the wrong chemicals.

1. Describe possible sources of error in this experiment.

Questions 2 - 5 are based upon the following scenario:

A testing laboratory has been hired by a company called "Drug Company Q" to analyze a series of over-the-counter drugs that the company produces. In all of these over-the-counter drugs, the active ingredient is called "Active Ingredient M." The laboratory technician collected the data from samples with known concentrations of Active Ingredient M. The data is shown below in Table 2.

Table 2. Known Concentrations of Active Ingredient M Drug

Sample Identification Code Sample Concentration (M) Absorbance

Q5000 4.00 x 10 0.750

Q5001 3.20 x 10 0.602

Q5002 2.40 x 10 0.447

Q5003 1.60 x 10 0.299

Q5004 8.00 x 10 0.150

The technician also collected absorbance readings for 5 over-the-counter drugs for review. The data collected for the 5 over-the-counter drugs is shown in Table 3.

Table 3. Absorbance Data for Over-the-counter Drugs

Sample Identification Code Absorbance

M21050-1 0.359

M21050-2 0.356

M21050-3 0.339

M21050-4 0.376

M21050-5 0.522

2. Create a Beer’s law plot and best f it line using the data in Table 2. Upload an image of the graph into Graph 4.

-4

-5

Graph 1: Resistance vs. Concentration

2.17 x 10-4M

2.14 x 10-4M

2.04 x 10-4M

2.27 x 10-4M

3.00 x 10-4M

3. Use the Beer’s law plot and best f it line to determine the concentrations for samples: M21050-1, M21050-2, M21050-3, M21050-4, M21050-5.

Assuming that the results in Question 3 are 100% accurate and without error, I think the company’s statement is inaccurate and the percent error between the reported concentration and the concentration calculated in Question C is approximately 39%.

4. T he company reported that sample M21050-2 has an M concentration of 0.0003 M. Assuming that the results in Question 3 are 100% accurate and without error, is the company’s statement accurate? What is the percent error between the reported concentration and the concentration calculated in Question 3?

T here appears to only be one sample analyzed that meets the legal requirements needed which would be M20150-5 (3.00*10 M).

5. By law, Drug Company Q must have an M concentration between 2.85 x 10 M and 3.15 x 10 M. Do all samples analyzed meet the legal requirements? Use the information f rom Question 3 to explain your answer.

-4 -4

-4

Graph 2: % Transmittance vs. Concentration

Graph 3: Absorbance vs. Concentration

Graph 4: Exercise Question 2