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- 1. Calculate the energy and frequency of the electromagnetic radiation that has a wavelength of 134 nm. At what region of the electromagentic radiation does this belong? 2. A solution containing 4.48 ppm KMnO4 has an absorbance of 0.265 in a 1.00 cm cell at 520 nm. If the percent transmittance of an unknown solution is 63.2%, what is the absorbance of the solution? Calculate the concentration of the unknown solution.A 0.035 g of KMnO4 was dissolved in 200 mL of distilled water. This solutionhad a transmittance of 40.5% when measured in a 1.05 cm cell at a wavelengthof 525 nm. Calculate the molar absorptivity of KMnO4. (MM = 158.034 g/mol)What value of absorbance corresponds to 45.0% T? If a 0.010 M solution exhibits 45.0% T at some wavelength what will be the percent transmittance for a 0.020 M solution of the same substance?
- The absorbance of an ionic aqueous solution is 0.387. What is the ratio of intensities of the passed light over the incident light for that solution? I/IO =1.) Beer's Law can be used to find the concentration of a solution by measuring its absorbance. The law is given by ?=???A=ϵbC Where A is the absorbance, ?ϵ is the molar absorptivity, b is the pathlength of the light (the width of the sample cell), and C is the concentration of the solution. A student is analyzing a solution of a metal, and finds that the absorbance of the solution is 0.532. If ?=187 L⋅g−1⋅cm−1ϵ=187 L⋅g−1⋅cm−1 and ?=1 cmb=1 cm , what is the concentration of the metal in solution (in g/L)? * 352 * 2.84×10−32.84×10−3 * 2.84×10−22.84×10−2 * 96.8 2.) How many significant figures does the number 0.00358 have? Group of answer choices a.1 b.2 c.3 d.5 3.) A 10.00 mL solution of a certain food dye has a concentration of 1.47 g /L. What is the total mass of food dye in the solution? Report your answer with the correct number of significant figures.A 2.845 g sample of an unknown compound containing cobalt(II) ion was dissolved in water in a 250 mLvolumetric flask. The absorbance of this solution was found to be 0.2195 at 515 nm in a 1 cm cell.Using the values of absorbance obtained, calculate the percentage of cobalt in the unknown compound.
- When preparing a solution containing 1.00 mg of iron (as thiocyanate complex) in 100 mL, it is found to transmit 85.0% of the incident light, compared to an appropriate blank. What will be the % transmittance of a solution three times more concentrated in iron?A solution containing 1.00 mg ion (as the thiocyanate complex) in 100 mL was observed to transmit 70 % of the incident light compared to an appropriate blank. (a) What is the absorbance of this solution at this wavelength? (b) What fraction of light would be transmitted by a solution of iron four times as concentrated?Describe the basic design difference between a spectrometer for absorption measurements and one for emission studies?
- A sample of a colored analyte at a concentration of 3.60 ´ 10-3 mol/L shows 34.2 percent transmittance in a 2.00 cm cell. What is the value of a in the Beer’s law equation for this substance at the wavelength measured? If a sample of the colored analyte of unknown concentration gives an absorbance, A, of 0.520 in the same cell at the same wavelength, what is the concentration of the analyte in this solution?The nickel level in a soil sample was determined using AAS. A 3.0 g sample was dissolved in acid and then diluted to a total volume of 100.0 mL. The absorbance of this solution determined at a wavelength of 232 nm, was found to be0.3. Several standard solutions were tested under the same conditions and a calibration curve shown below was obtained. Calculate the mass of nickel in mg.What causes light refractics, what does the index of refraction (n) express?