![F17 MATERIALS 0.12 g [Fe(phen)3]Cl2 (students red crystals from the previous experiment) 0.5 mL unknown [Fe(phen)3]Cl2 solut](http://img.homeworklib.com/questions/f81da5e0-750d-11ea-93cf-0fe5fca8ee48.png?x-oss-process=image/resize,w_560)
Homework Answers
Q1:
Abs = c.l
0.89 = 7500 Lmol-1.cm-1 × c × 1.0 cm
c = 1.187×10-4 mol/L
Concentration = 1.2×10-4 mol/L (Answer)
Q2:
Abs = 1.75 is not a reliable data .
To improve the data , we need to dilute the solution so that Abs should be less than 1 .
Q3:
For dilution, water is added , the number of moles of solute remains same . We can apply M1V1 = M2V2
0.50M × V1 = 1.5×10-2 M × 100.0ml
V1 = 3.0 ml
The stock solution required = 3.0ml. (Answer)
Q4:
Abs = .c.l
0.28 = 18200M-1cm-1 × c × 1cm
c = 1.538×10-5 M
Concentration of drug in the urine = 1.538×10-5M ×(15.00ml/10.00ml ) = 2.3×10-5 M
The concentration of drug is less than 5×10-5 M , hence we can conclude that the person is not using illegal drugs .
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F17 MATERIALS 0.12...
F17 UTA-401 4. A test for drug use involves ad residue is present in the sample the solution Because other things in ur...
F17 UTA-401 4. A test for drug use involves ad residue is present in the sample the solution Because other things in urine may give sig concentration of 5.0x10 M drug residue in drug use involves addition of 10.00 mL of colorless reagent to 10.00 mL urine. If drug it in the sample the solution turns blue (A max = 605 nm, ε = 18,200 M'cm). ngs in urine may give slightly positive results, only tests that measure a minimum...
Percent by mass of dye in Fruit Loops cereal 11.56*100 QUESTIONS: 1. If the molar extinction coefficient (E) of a...
Percent by mass of dye in Fruit Loops cereal 11.56*100 QUESTIONS: 1. If the molar extinction coefficient (E) of a compound is 2.5 x 108 moli'cmat $28 nm and the Abs Cat 528 nm) 0.254 Dind the concentration of that solution. (assume a path length of 1.0 cm) 2. If a student measures a sample that gives an Abs = 1.85 at the 2max, is this data reliable? If not, then what might they do to improve their data? 3....
A test for drug use involves addition of 5.00mL of colorless reagent to 10.00 mL urine.If...
A test for drug use involves addition of 5.00mL of colorless reagent to 10.00 mL urine.If drug residue is present in the sample the solution turns blue(λmax = 605 nm, ε = 18,200M-1cm-1). Because other things in urine may give slightly positive results, only tests that measure a minimum concentration of 5.0 x 10-5 M drug residue in the original urine sample are considered positive for illegal drugs. When you measure the sample using the test described above and get...
4. A test for drug use involves addition of 10.00 mL of colorless reagent to 10.00...
4. A test for drug use involves addition of 10.00 mL of colorless reagent to 10.00 mL urine. If drug residue is present in the sample the solution turns blue ( 605 nm, <= 18,200 M-'cm'). Because other things in urine may give slightly positive results only tests that measure a minimum concentration of 5.0x10° drug residue in the original urine sample are considered positive for illegal drugs. When you measure the sample using the test described above and get...
please please help explain how to do this all the way to the answer 4. You...
please please help explain how to do this all the way to the
answer
4. You prepare several dilutions of an unknown compound. You measure the absorbance of each solution at 340 nm using a 1 cm cuvette (your results are listed in the table below). What is the extinction coefficient (in (M•cm)!) of the compound? (Hint: assume that each of the individual values contains some degree of experimental error.) Concentration(UM) 0.5 Absorbance at 340 nm (From evcel graph) Slope...
Hi, I need help with answering these questions. Thank you. 1) What is the molar absorptivity...
Hi, I need help with answering these questions. Thank you.
1) What is the molar absorptivity of riboflavin (with units)?
Assume that the cuvette has a pathlength of 1.00 cm and that the
blank had an absorbance of 0.00.
2. If a sample of riboflavin with an unknown concentration had
an absorbance of 0.597, what is the concentration of the
sample?
3. A sample of riboflavin is prepared by crushing 5 tablets and
dissolving them in enough water to create...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
Doing a Chem Review, these are just study scenarios that I need to have a good...
Doing a Chem Review, these are just study scenarios that I need
to have a good understanding of
6. To determine the concentration of SCN in our saliva, we reacted the SCN in the saliva with Fe' according to the following reaction: We measured the absorbance of the FeSCN and used the absorbance value of the FesCN2 to obtain the concentration of the FesCN2*. This was achieved by measuring the absorbance values of standard FeSCN2+ solutions and constructing a calibration...
SHOW WORK CLEARLY, DO ALL PARTS AND USE SIGNIFICANT FIGURES! DO QUESTION 8 ONLY!!! IF YOU...
SHOW WORK CLEARLY, DO ALL PARTS AND USE SIGNIFICANT FIGURES! DO
QUESTION 8 ONLY!!! IF YOU DO QUESTION 7 I WILL REPORT YOU
QUESTION 7 1 points Save Answer Eshaq measures the absorbance at 447 nm of a sample prepared by mixing 10.00 mL of 0.200 M Fe(NO3)3 in 1 M HNO3 with 2.00 mL of 0.00200 M KSCN, and 8.00 mL of water. He prepares the sample in a test tube, and then transfers some of the solution to...
Please help! Ligand X forms a complex with both cobalt and copper, cach of which has...
Please help!
Ligand X forms a complex with both cobalt and copper, cach of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.217 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.493 at 510...
F17 UTA-401 4. A test for drug use involves ad residue is present in the sample the solution Because other things in urine may give sig concentration of 5.0x10 M drug residue in drug use involves addition of 10.00 mL of colorless reagent to 10.00 mL urine. If drug it in the sample the solution turns blue (A max = 605 nm, ε = 18,200 M'cm). ngs in urine may give slightly positive results, only tests that measure a minimum...
Percent by mass of dye in Fruit Loops cereal 11.56*100 QUESTIONS: 1. If the molar extinction coefficient (E) of a compound is 2.5 x 108 moli'cmat $28 nm and the Abs Cat 528 nm) 0.254 Dind the concentration of that solution. (assume a path length of 1.0 cm) 2. If a student measures a sample that gives an Abs = 1.85 at the 2max, is this data reliable? If not, then what might they do to improve their data? 3....
4. A test for drug use involves addition of 10.00 mL of colorless reagent to 10.00 mL urine. If drug residue is present in the sample the solution turns blue ( 605 nm, <= 18,200 M-'cm'). Because other things in urine may give slightly positive results only tests that measure a minimum concentration of 5.0x10° drug residue in the original urine sample are considered positive for illegal drugs. When you measure the sample using the test described above and get...
please please help explain how to do this all the way to the
answer
4. You prepare several dilutions of an unknown compound. You measure the absorbance of each solution at 340 nm using a 1 cm cuvette (your results are listed in the table below). What is the extinction coefficient (in (M•cm)!) of the compound? (Hint: assume that each of the individual values contains some degree of experimental error.) Concentration(UM) 0.5 Absorbance at 340 nm (From evcel graph) Slope...
Hi, I need help with answering these questions. Thank you.
1) What is the molar absorptivity of riboflavin (with units)?
Assume that the cuvette has a pathlength of 1.00 cm and that the
blank had an absorbance of 0.00.
2. If a sample of riboflavin with an unknown concentration had
an absorbance of 0.597, what is the concentration of the
sample?
3. A sample of riboflavin is prepared by crushing 5 tablets and
dissolving them in enough water to create...
Table 1. Concentrations of [Fe(Phen),1?, M, in water and UV- vis absorbance values recorded at 2 -505 nm. Concentration of [Fe(Phen)/, M Absorbance 9.500 x 10 0.999 4.250 x 10 0.480 0.219 2.125 10% 1.063 x 10 0.104 0.000 0.003 Table 2. UV-vis absorbance values of [Fe(phen)]* held at 35 °C after mixing with H SO, and recorded at 5 minute intervals (in water at max = 505 nm). Time (minutes) Absorbance 0.997 0.935 0.877 0.823 0.772 0.724 0.680 0.638...
Doing a Chem Review, these are just study scenarios that I need
to have a good understanding of
6. To determine the concentration of SCN in our saliva, we reacted the SCN in the saliva with Fe' according to the following reaction: We measured the absorbance of the FeSCN and used the absorbance value of the FesCN2 to obtain the concentration of the FesCN2*. This was achieved by measuring the absorbance values of standard FeSCN2+ solutions and constructing a calibration...
SHOW WORK CLEARLY, DO ALL PARTS AND USE SIGNIFICANT FIGURES! DO
QUESTION 8 ONLY!!! IF YOU DO QUESTION 7 I WILL REPORT YOU
QUESTION 7 1 points Save Answer Eshaq measures the absorbance at 447 nm of a sample prepared by mixing 10.00 mL of 0.200 M Fe(NO3)3 in 1 M HNO3 with 2.00 mL of 0.00200 M KSCN, and 8.00 mL of water. He prepares the sample in a test tube, and then transfers some of the solution to...
Please help!
Ligand X forms a complex with both cobalt and copper, cach of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.217 g sample containing cobalt and copper was dissolved and diluted to a volume of 100.0 mL. A solution containing ligand X was added to a 50.0 mL aliquot of the sample solution and diluted to a final volume of 100.0 mL. The measured absorbance of the unknown solution was 0.493 at 510...
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