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You are given two containers, one with 3.00 mg Mn 2+ and one with an unknown amount of Mn 2+ .
You oxidize the Mn 2+ to the purple permanganate ion (MnO 4 - ) and dilute the solutions to 250.0 mLs.
The solution containing the 3.00 mg Mn is used to prepare a third solution containing 1.50 mg Mn.
The transmittances of the solutions are measured at 530 nm using a dilapidated Spectronic 20. From
the data below, calculate the amount of Mn in the unknown. For a linear curve, consider y=kx+b
Mn (mg) %T
3.00 30.8
1.50 55.2
Unknown 37.4
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Solved in 3 steps with 2 images
- 1. A compound has a molar absorptivity of 3.031 x 10° L cm1 mol1. If a 15.00 mm-length cell is used to hold the sample, and a transmittance of 19.53 % is measured, what is the molarity of the compound in solution?Find the concentration of a solution with a transmittance of 0.27 AU and molar absorptivity of 3.65 x 104 M- cm in a 1.00 cm cell.A solution containing 8.75 ppm KMnO4 has a transmittance of 0.743 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of KMnO4.
- A 1.2cm diameter glass cuvette is filled with a Cu(NH3)42+ solution that is deep blue. The cuvette is placed into a pre-blanked spectrophotometer. At 620nm, the transmittance is 23%. If the solution has molarity = 0.0133 M and path length of light through the solution = 1.2 cm, what is the value of molar absorptivity at 620 nm?A 7.21 x 10−5 M solution of potassium permanganate has a transmittance of 52.1% whenmeasured in a 3.81-cm cell at a wavelength of 550 nm. Calculate (a) the absorbance of thissolution and (b) the molar absorptivity of KMnO43.) The accuracy of a spectrophotometer is evaluated by preparing a solution of 60.06 ppm K2Cr2O7 and measuring its absorbance at a wavelength of 350 nm in a cell with a pathlength of 1.00 cm. The expected absorbance is 0.640. What is the expected molar absorptivity of K2Cr2O7 at this wavelength? 4.) A solution’s transmittance is 35.0%. What is the transmittance if you dilute the solution to half of its initial concentration?
- .A 8 × 10-5 M solution of potassium permanganate has a transmittance of 45% when measured in 2.0 cm cell at wavelength of 526 nm. Calculate (a) the absorbance of this solution and (b) the molar absorptivity of KMnO4.The percent transmittance of a solution containing 2.46 x 10-5 M NazX was 22.6 at 210 nm in a 1.00-cm cell. Calculate the molar absorptivity of NazX at 210 nm. 2.63 x 104 5.50 x 104 5.50 x 103 4.52 x 103The standard curve was made by spectrophotographic analysis of equilibrated iron(III) thiocyanate solutions of known concentration. You are asked to analyze a Fe(SCN)2+ solution with an unknown concentration and an absorbance value of 0.392. The slope-intercept form of the equation of the line is y = 4538.1x +0.0077. The unknown was analyzed on the same instrument as the standard curve solutions at the same temperature. What is the Fe³+ concentration of the unknown solution? [Fe³+] = mol/L Absorbance Iron(III) thiocynate standard curve 1.0 V 0.5 0.0001 Fe³+ concentration (M) 0 0.0002
- A solution containing 5.75 mg/100 mL of X (335 g/mol) has a transmittance of 41.6% in a 2.0 cm cell at 425 nm. Calculate the molar absorptivity of X at this wavelength. Note that: A = -log TA student prepared a calibration curve by measuring the absorbance of a series of standard solutions of a common antibacterial compound at 293 nm, using a cuvette with a pathlength of 5.00 cm. When fitted with a linear function, the following equation was obtained from the graph: у 3 204.5 М What is the molar absorptivity of the compound at 293 nm? -1 A. 0.0244 M'cm -1 -1 -1 В. 1.43 М cm C. 0.287 M -1 cm /D. 40.9 M cm -1Suppose a student is preparing a set of standard solutions for use in a spectrophotometric study. If percent transmittance, %T, were measured in the standard solutions before the color had a chance to fully develop, the measured value would be compared with solutions that have allowed the color to fully develop.