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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?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 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 KMnO4
- 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 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.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?
- 3.) 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 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 TThe 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 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 -1A inorganic compound whose concentrations is 0.013 M in a 1 cm pathlength cell has transmittance of T=8.23%.(i) Find the absorbance (A) and(ii) The molar absorptivity.At 520 nm with a 1.00 cm cell a 8.24 ppm solution of KMnO4 has a transmittance of 0.126. What is the molar absorptivity of KMnO4 at 520 nm?