A controversy broke out as a dead body was found in a bar on Cornelia Street. The media revealed that minutes before the person died, he described his drink as something stronger than other drinks in the bar. You were the analyst tasked to verify the cause of death. Preliminary qualitative tests showed the possible presence of cyanide in the victim's death. Thus, you tried to quantitatively detect cyanide ions in the victim's drink using spectrophotometric analysis. Standard solutions were of different CN- concentrations were made as shown in Table 2. A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of 50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm cells and at Amax = 725 nm and found in Table 2. Table 2. Raw absorbance measurements for each standard solution of CN-. [CN-] prior to dilution, M Abs@725nm 0.002 0.000 0.040 0.160 0.100 0.390 0.160 0.630 0.240 0.950 0.320 1.260 0.400 1.580 a. Plot the absorbance vs final concentration of the standard solutions. Show the (1) table of data used; (2) equation of the line; and (c) r² value. b. What is the molar absorptivity of the solution? From a 50.0 mL drink sample, an 10.0-mL aliquot was taken for analysis. It was mixed with 10.0 mL 1% (m/v) HCl to prevent metal precipitation and diluted to 25.0 mL with distilled water. A corrected absorbance of 0.165 was recorded. c. Determine the concentration of CN- (M) in the 50.0 mL-sample. d. Based on your reference, the minimum amount of cyanide to induce human poisoning in one drink is 11.0 ppm. As the analyst, what can you conclude about the victim's death?
A controversy broke out as a dead body was found in a bar on Cornelia Street. The media revealed that minutes before the person died, he described his drink as something stronger than other drinks in the bar. You were the analyst tasked to verify the cause of death. Preliminary qualitative tests showed the possible presence of cyanide in the victim's death. Thus, you tried to quantitatively detect cyanide ions in the victim's drink using spectrophotometric analysis. Standard solutions were of different CN- concentrations were made as shown in Table 2. A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of 50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm cells and at Amax = 725 nm and found in Table 2. Table 2. Raw absorbance measurements for each standard solution of CN-. [CN-] prior to dilution, M Abs@725nm 0.002 0.000 0.040 0.160 0.100 0.390 0.160 0.630 0.240 0.950 0.320 1.260 0.400 1.580 a. Plot the absorbance vs final concentration of the standard solutions. Show the (1) table of data used; (2) equation of the line; and (c) r² value. b. What is the molar absorptivity of the solution? From a 50.0 mL drink sample, an 10.0-mL aliquot was taken for analysis. It was mixed with 10.0 mL 1% (m/v) HCl to prevent metal precipitation and diluted to 25.0 mL with distilled water. A corrected absorbance of 0.165 was recorded. c. Determine the concentration of CN- (M) in the 50.0 mL-sample. d. Based on your reference, the minimum amount of cyanide to induce human poisoning in one drink is 11.0 ppm. As the analyst, what can you conclude about the victim's death?
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 7P
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![A controversy broke out as a dead body was found in a bar on Cornelia Street. The media
revealed that minutes before the person died, he described his drink as something stronger
than other drinks in the bar. You were the analyst tasked to verify the cause of death.
Preliminary qualitative tests showed the possible presence of cyanide in the victim's death.
Thus, you tried to quantitatively detect cyanide ions in the victim's drink using
spectrophotometric analysis.
Standard solutions were of different CN- concentrations were made as shown in Table 2.
A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored
complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of
50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm
cells and at Amax = 725 nm and found in Table 2.
Table 2. Raw absorbance measurements for each standard solution of CN-.
[CN-] prior to dilution, M
Abs@725nm
0.002
0.000
0.040
0.160
0.100
0.390
0.160
0.630
0.240
0.950
0.320
1.260
0.400
1.580
a. Plot the absorbance vs final concentration of the standard solutions.
Show the (1) table of data used; (2) equation of the line; and (c) r² value.
b. What is the molar absorptivity of the solution?
From a 50.0 mL drink sample, an 10.0-mL aliquot was taken for analysis. It was mixed
with 10.0 mL 1% (m/v) HCl to prevent metal precipitation and diluted to 25.0 mL with
distilled water. A corrected absorbance of 0.165 was recorded.
c. Determine the concentration of CN- (M) in the 50.0 mL-sample.
d. Based on your reference, the minimum amount of cyanide to induce human
poisoning in one drink is 11.0 ppm. As the analyst, what can you conclude about
the victim's death?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F62c0aed7-ad54-4a6e-bd74-2c867d908b6b%2F1b0a6445-4f88-4287-a470-0124862107ba%2Fbgt34ni_processed.png&w=3840&q=75)
Transcribed Image Text:A controversy broke out as a dead body was found in a bar on Cornelia Street. The media
revealed that minutes before the person died, he described his drink as something stronger
than other drinks in the bar. You were the analyst tasked to verify the cause of death.
Preliminary qualitative tests showed the possible presence of cyanide in the victim's death.
Thus, you tried to quantitatively detect cyanide ions in the victim's drink using
spectrophotometric analysis.
Standard solutions were of different CN- concentrations were made as shown in Table 2.
A 25.0mL aliquot of each standard solution was added with Fe(NO3)3 to form the colored
complex, [Fe(CN)6]³ (aq). Each standard solution was then diluted to a total volume of
50.0 mL. The absorbances of the diluted standard solutions were recorded using 1.00-cm
cells and at Amax = 725 nm and found in Table 2.
Table 2. Raw absorbance measurements for each standard solution of CN-.
[CN-] prior to dilution, M
Abs@725nm
0.002
0.000
0.040
0.160
0.100
0.390
0.160
0.630
0.240
0.950
0.320
1.260
0.400
1.580
a. Plot the absorbance vs final concentration of the standard solutions.
Show the (1) table of data used; (2) equation of the line; and (c) r² value.
b. What is the molar absorptivity of the solution?
From a 50.0 mL drink sample, an 10.0-mL aliquot was taken for analysis. It was mixed
with 10.0 mL 1% (m/v) HCl to prevent metal precipitation and diluted to 25.0 mL with
distilled water. A corrected absorbance of 0.165 was recorded.
c. Determine the concentration of CN- (M) in the 50.0 mL-sample.
d. Based on your reference, the minimum amount of cyanide to induce human
poisoning in one drink is 11.0 ppm. As the analyst, what can you conclude about
the victim's death?
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