a.ec 9. Ifaqueous Co(NO), has a molar absorptiv /mol-cm at 505 nm, what will be the...
Suppose a solution of Co(NO3)2 has an extinction coefficient of 5.1L/mol-cm at 505 nm. On graph paper, plot a graph of A versus C (mol/L) for solutions of 0.020, 0.040, 0.060, 0.080, and 0.100 M Co(NO3)2 in a 1-cm cell. On the same graph plot, the percent transmittance, or %T, of each solution versus concentration
A solution of a specific vitamin has a Imax of 287 nm and a concentration of 4.93 x 10-7M. The absorbance of the solution at 287 nm is A = 0.135. What is the molar absorptivity of the vitamin at 287 nm? A sample path length is 1.00 cm. molar absorptivity: L mol-'cm-1
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
A specific steroid has a Amax of 284 nm and a molar absorptivity e of 11,500 L mol cm1. What is the concentration of the compound in a solution whose absorbance at 284 nm is A 0.065 with a sample pathlength of 1.00 cm? concentration: М
Consider absorption spectrophotometry performed at 490 nm. A chemical species with an aqueous solution concentration of 0.250 M gives an absorbance of 0.385 with a path length of 1.00 cm. A. What is the frequency in Hz of 490 nm radiation? B. What is the energy of a photon of 490 nm radiation C. What is the molar absorptivity () at 490 nm? D. What is the percentage transmission of a solution that has an absorbance of 0.385 ?
Question 8 Status: Tries remaining: 21 Points possible: 1.00 Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette. cm what is The absorbance of the solution at 427 nm is 0.46. If the molar absorptivity of yellow dye at 427 nm is 27400 M the concentration of the solution? Answer: Question 9 Status: Tries remaining: 2 Points possible: 1.00 If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope...
A solution of a specific vitamin has ?max-231 nm and a concentration of 4.48 10.7 M. The absorbance of the solution at 231 nm is A0.145. What is the molar absorptivity of the vitamin 231 m? (sample pathlength- 1.00 cm) Number L mol cm
Assume the molar absorptivity (ε) for CoCl42- at 700 nm is 412.2 M-1 cm-1. If d, the cell path length, is equal to 0.85 cm for the cuvettes being used, and if the measured absorbance (A) at 700 nm is 1.305, what is [CoCl42-]? Express your response to four digits after the decimal.
At 575.0 nm, a solution containing 0.0156 g/L CuSO4 (159.61 g/mol) in a cell of path length 2.00 cm gave an absorbance (A) of 0.1549. Calculate (at 575 nm): a) the molarity of CuSO4 b) the absorptivity of CuSO4 units of (L/g.cm) c) the molar absorptivity of CuSO4 [Report the results, without units, to three sig.fig.]
A compound whose molecular weight is 100 g/mol, has a molar absorptivity of 1.00X10^5 M-1 cm-1. How many grams of this compound should be dissolved in exactly 1 liter of solution so that after diluting it 200 times the solution has an absorbance of 0.500 in a cell of 1.00 cm?