A solution of potassium permanganate (KMnO4) whose concentration is 1.28X10^-4 M has a transmittance of 0.5...
A solution of potassium permanganate (KMnO4) whose concentration
is 1.28X10^-4 M has
a transmittance of 0.5 at a wavelength of 522 nm, in a 1.0 cm
cell.
a) What absorbance does this solution have?
b) If the absorbance were double, what would be the
transmission?
c) What concentration would correspond to a transmittance of 0.75
in this cell?
Homework Answers
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A solution of potassium permanganate (KMnO4) whose concentration
is 1.28X10^-4 M has
a transmittance of 0.5...
How many grams of potassium permanganate (KMnO4) are required to prepare a 250-mL solution whose concentration...
How many grams of potassium permanganate (KMnO4) are required to prepare a 250-mL solution whose concentration is 2.16 M?
Another sample of KMnO4 solution has 80% of light of a given , passing through it...
Another sample of KMnO4 solution has 80% of light of a given , passing through it was transmitted when a cell of 4 cm was used for the sample analysis and the molar absorptivity was 2. Show that the concentration is 0.05 g/L Calculate the transmittance and Absorbance if the %T is (a) 1% (b) 10% (c) 100% If 25.8 mg of Benzene is dissolved in 250 ml of solution that absorbed at 256 nm, with absorption coefficient or molar...
Potassium permanganate (KMnO4) solutions are used for the determination of iron in samples of unknown concentration....
Potassium permanganate (KMnO4) solutions are used for the determination of iron in samples of unknown concentration. As a laboratory assistant, you are supposed to prepare 1500. mL of a 0.400 M KMnO4 solution. What mass of KMnO4, in grams, do you need? After, What is the molar concentration of a solution of sulfuric acid, H2SO4, if 5.95 mL react completely with 0.132 g of NaOH which was dissolved in enough water to make 200.mL of solution?
An aspirin solution of unknown concentration was studied using ultraviolet spectroscopy. This solution had a percent...
An aspirin solution of unknown concentration was studied using ultraviolet spectroscopy. This solution had a percent transmittance of 37.3 when measured at 273 nm in a 1.000-cm cell. Aspirin is known to have a molar absorptivity of 741 M-1cm-1 at this wavelength. a. Calculate the absorbance of this solution b. What is the concentration of aspirin in this solution? c. What would be the absorbance of a solution prepared by taking 10.00mL of this solution and diluting to 100.00mL in...
C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proporti...
C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proportional to concentration? 2. The absorbance of a 2.3lx 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm 3. A compound with a molecular weight of 292.16 was dissolved in a 5-ml volumetric flask. A 1.00-mLaliquat was withdrawn, placed in a 10-mL volumetric flask, and diluted to the mark....
Experiment #9 Post-Lab Problems (continue): 4. If a 0.060 M sample of Co(NO3)2 gave an absorbance...
Experiment #9 Post-Lab Problems (continue): 4. If a 0.060 M sample of Co(NO3)2 gave an absorbance of 0.29 at 500 nm in a 1 cm cell. What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wavelength? 5. How are percent transmittance and absorbance related mathematically? What would be the absorbance of a sample with 13% transmittance?
Question (4 a) A sample that contains a known concentration of potassium permanganate KMn04, show...
Question (4 a) A sample that contains a known concentration of potassium permanganate KMn04, showed the following reading, what is the absorption maxima a Absorption vs. Wavelength for Maximum Absorbance Determination Wavelength (nm) 15 Marks ",.01 E. , ET ET. 81. EV. EA. ,YoT 0.373 0.515 0.671 0.842 0.961 1.063 0.991 0.971 0.657 0.612 0.357 0.161 0.127 0.105 er. OA. 09. ) The determination of Fe in an industrial waste was carried out by using o- phenanthroline using the following...
The concentration of a solution is 10.0 M. It has an absorbance of 0.200 when placed...
The concentration of a solution is 10.0 M. It has an absorbance of 0.200 when placed in a 1.00 cm cuvette at the wavelength of 250 nm. What would be the absorbance if the solution is 5.00 M? Assume both concentrations are in the analytical range (within linear).
I need help with 5 & 7 please (a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085...
I need help with 5 & 7 please
(a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085 (c) 39.4% (f) 5.38% *13-3 Calculate the percent transmittance of solutions having half the abse solutions in Problem 13-1. f the absorbance of the cent transmittance of *13-4 Calculate the absorbance of solutions having twice the percent transmiti those in Problem 13-2. *13-5 A solution containing 6.23 ppm KMnO, had a transmittance of 0.195 in a 10 cell at 520 nm. Calculate the molar...
2. The absorbance of a 2.31 % 10 M solution of a compound is 0.822 at...
2. The absorbance of a 2.31 % 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm. The following absorption data were calculated in an experiment: Absorbance 0.000 0.00 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration 0.000 1x10-3 2x10-3 3x10-3 4x10- 5x10- 6x10 3 7x10- 8x1 (M) Plot Absorbance vs. Concentration and a) calculate the molar absorptivity coefficient from the slope if the...
Another sample of KMnO4 solution has 80% of light of a given , passing through it was transmitted when a cell of 4 cm was used for the sample analysis and the molar absorptivity was 2. Show that the concentration is 0.05 g/L Calculate the transmittance and Absorbance if the %T is (a) 1% (b) 10% (c) 100% If 25.8 mg of Benzene is dissolved in 250 ml of solution that absorbed at 256 nm, with absorption coefficient or molar...
C. Problems 1Explain the difference between transmittance, absorbance, and molar absorptivity Which one is proportional to concentration? 2. The absorbance of a 2.3lx 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm 3. A compound with a molecular weight of 292.16 was dissolved in a 5-ml volumetric flask. A 1.00-mLaliquat was withdrawn, placed in a 10-mL volumetric flask, and diluted to the mark....
Experiment #9 Post-Lab Problems (continue): 4. If a 0.060 M sample of Co(NO3)2 gave an absorbance of 0.29 at 500 nm in a 1 cm cell. What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wavelength? 5. How are percent transmittance and absorbance related mathematically? What would be the absorbance of a sample with 13% transmittance?
Question (4 a) A sample that contains a known concentration of potassium permanganate KMn04, showed the following reading, what is the absorption maxima a Absorption vs. Wavelength for Maximum Absorbance Determination Wavelength (nm) 15 Marks ",.01 E. , ET ET. 81. EV. EA. ,YoT 0.373 0.515 0.671 0.842 0.961 1.063 0.991 0.971 0.657 0.612 0.357 0.161 0.127 0.105 er. OA. 09. ) The determination of Fe in an industrial waste was carried out by using o- phenanthroline using the following...
I need help with 5 & 7 please
(a) 15.8% (d) 23.8% (b) 0.492 (e) 0.085 (c) 39.4% (f) 5.38% *13-3 Calculate the percent transmittance of solutions having half the abse solutions in Problem 13-1. f the absorbance of the cent transmittance of *13-4 Calculate the absorbance of solutions having twice the percent transmiti those in Problem 13-2. *13-5 A solution containing 6.23 ppm KMnO, had a transmittance of 0.195 in a 10 cell at 520 nm. Calculate the molar...
2. The absorbance of a 2.31 % 10 M solution of a compound is 0.822 at a wavelength of 266 nm in a 1.00 cm cell. Calculate the molar absorptivity at 266 nm. The following absorption data were calculated in an experiment: Absorbance 0.000 0.00 0.181 0.271 0.361 0.450 0.539 0.627 0.7 Concentration 0.000 1x10-3 2x10-3 3x10-3 4x10- 5x10- 6x10 3 7x10- 8x1 (M) Plot Absorbance vs. Concentration and a) calculate the molar absorptivity coefficient from the slope if the...
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