2.35 x 10-4 g of a purple dye was combined with 50.0 mL, for a final...
2.35 x 10-4 g of a purple dye was combined with 50.0 mL, for a final concentration of 27.5 µM. What is the molar mass of the dye?
Answer: 171 g/mol
a. The same dye solution was found to have an absorbance of 0.381. What color of light would you expect for its λmax? What is the molar absorptivity?
Answer: λmax at yellow, 13900 M-1 cm-1
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2.35 x 10-4 g of a purple dye was combined with 50.0 mL, for a
final...
2. A yellow dye, FD&C yellow 3, is used in some candy coatings. A 1.50 X...
2. A yellow dye, FD&C yellow 3, is used in some candy coatings. A 1.50 X 10M solution of this dye has an absorbance of 0.209 at its a. Calculate the molar absorptivity, €, of the dye at this wavelength, assuming a sample cell with a 1.0 cm pathlength. b. The yellow dye from one piece of candy is completely extracted into 10.0 mL of water and diluted to 50.0 mL with water. The absorbance of the diluted solution is...
2. Below the color scale you dow n , which is e the dye measured at...
2. Below the color scale you dow n , which is e the dye measured at different so m Apply ad the whole different between th dyes COVERI A NAD NADH Laboratory Report 10 OM DORD 1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the...
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...
ILI Up 2017 Midterm Exam TWO 5. (10 pts) 10.00 mL of a concentrated dye solution...
ILI Up 2017 Midterm Exam TWO 5. (10 pts) 10.00 mL of a concentrated dye solution is diluted to 750. spectroscopic measurement of the diluted solution rives a percent transmittance, 22.5% for measurements in a cuvet having a pathlength of 2.50 cm and a molar absorptivity of 1050 (L/mol cm)). What is the concentration of the original (undiluted solution
Need help for questions 2 and 4 G. C. 1-7 Determination of the Dye Concentration in...
Need help for questions 2 and 4
G. C. 1-7 Determination of the Dye Concentration in a Powdered Drink G. C. 1-7: PART 2 GROUP DISCUSSION QUESTIONS Lab partners' name: 1. Your TA will provide you with the correct concentration of the dye in the powdered drink solution. Calculate the percentage error for your data. (experimental value - accepted value) accepted value 2. The empirical formula for the Brilliant Blue dye is CanHyN,O,S, Na2 and the formula weight i 79286...
2. (a) What is the formula and color of the complex that forms when Fe" reacts...
2. (a) What is the formula and color of the complex that forms when Fe" reacts with 1,10- phenanthroline? (b) This complex absorbs strongly at which wavelength (in nm) of visible light? Indicate the color of light having this wavelength. (c) Is the color of the complex the same as th color of the light of maximum absorption? Would you expect them to be the same? Explain 3. What is the molar mass (in g/mol) of Fe(NH)(SO4): 6 H,0? 4....
Ligand X forms a complex with both cobalt and copper, each of which has a maximum...
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.241 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 0.447 at 510 nm and...
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical...
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical equilibrium is reached rapidly. Once equilibrium is established, the equilibrium constant can be calculated if the concentration of all the ions are known: [FeSCNP.he [SCN-... and (Feng Your task is to prepare three different equilibrium systems that contain different concentrations of these ions. Keep in mind that although the concentrations will be different, the value of the equilibrium constant Ke will be indeed constant...
18.5 mL of NaOH were required to titrate KHC.H4O4. Set up 3-step stoic concentration of NaOH....
18.5 mL of NaOH were required to titrate KHC.H4O4. Set up 3-step stoic concentration of NaOH. to titrate 0.242g of KHPhthalate, formula EP stoichiometric calculation for finding the [Answer: I. 1.185x10-3 mol KHPhthalate; l, 1.185 10 mol NaOH: III. 0,0640 M NaOH 2. The indicators below have the acid and base cators below have the acid and base colors shown. Their colors in the hair-equivalence solution of a weak acid is also shown. Estimate the pka or the weak acid....
Suppose 0.250 g of cobalt(II) chloride hexahydrate is dissolved in 50.0 ml of 4 M HCl,...
Suppose 0.250 g of cobalt(II) chloride hexahydrate is dissolved in 50.0 ml of 4 M HCl, and heated to 80°C in a cuvette having 1.00 cm path length. At this temperature, the percent transmittance of the solution at 690 nm is measured to be 48.0%. What is the molar mass of cobalt(II) chloride hexahydrate? Select one: a) 129.84 g/mol b) 237.93 g/mol c) 58.93 g/mol d) 165.87 g/mol
2. A yellow dye, FD&C yellow 3, is used in some candy coatings. A 1.50 X 10M solution of this dye has an absorbance of 0.209 at its a. Calculate the molar absorptivity, €, of the dye at this wavelength, assuming a sample cell with a 1.0 cm pathlength. b. The yellow dye from one piece of candy is completely extracted into 10.0 mL of water and diluted to 50.0 mL with water. The absorbance of the diluted solution is...
2. Below the color scale you dow n , which is e the dye measured at different so m Apply ad the whole different between th dyes COVERI A NAD NADH Laboratory Report 10 OM DORD 1. Draw the boundaries for the various ta below: bus ranges of colors of visible light on the wa le light on the wavelelige 750 nm 400 nm 700 nm 500 nm 600 nm 2. Below is an absorbance spectrum for a violet/purple the...
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...
ILI Up 2017 Midterm Exam TWO 5. (10 pts) 10.00 mL of a concentrated dye solution is diluted to 750. spectroscopic measurement of the diluted solution rives a percent transmittance, 22.5% for measurements in a cuvet having a pathlength of 2.50 cm and a molar absorptivity of 1050 (L/mol cm)). What is the concentration of the original (undiluted solution
Need help for questions 2 and 4
G. C. 1-7 Determination of the Dye Concentration in a Powdered Drink G. C. 1-7: PART 2 GROUP DISCUSSION QUESTIONS Lab partners' name: 1. Your TA will provide you with the correct concentration of the dye in the powdered drink solution. Calculate the percentage error for your data. (experimental value - accepted value) accepted value 2. The empirical formula for the Brilliant Blue dye is CanHyN,O,S, Na2 and the formula weight i 79286...
2. (a) What is the formula and color of the complex that forms when Fe" reacts with 1,10- phenanthroline? (b) This complex absorbs strongly at which wavelength (in nm) of visible light? Indicate the color of light having this wavelength. (c) Is the color of the complex the same as th color of the light of maximum absorption? Would you expect them to be the same? Explain 3. What is the molar mass (in g/mol) of Fe(NH)(SO4): 6 H,0? 4....
Ligand X forms a complex with both cobalt and copper, each of which has a maximum absorbance at 510 nm and 645 nm, respectively. A 0.241 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 0.447 at 510 nm and...
Fe (aq)SCN-(aq) FeSCN (aq) thiocyanate iron(II) thiocyanoiron(il) Introduction When the reactants shown above, are combined, chemical equilibrium is reached rapidly. Once equilibrium is established, the equilibrium constant can be calculated if the concentration of all the ions are known: [FeSCNP.he [SCN-... and (Feng Your task is to prepare three different equilibrium systems that contain different concentrations of these ions. Keep in mind that although the concentrations will be different, the value of the equilibrium constant Ke will be indeed constant...
18.5 mL of NaOH were required to titrate KHC.H4O4. Set up 3-step stoic concentration of NaOH. to titrate 0.242g of KHPhthalate, formula EP stoichiometric calculation for finding the [Answer: I. 1.185x10-3 mol KHPhthalate; l, 1.185 10 mol NaOH: III. 0,0640 M NaOH 2. The indicators below have the acid and base cators below have the acid and base colors shown. Their colors in the hair-equivalence solution of a weak acid is also shown. Estimate the pka or the weak acid....
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