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What wavelength is the peak absorbance of CoCl2?
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- A solution of copper(II) sulfate is observed to be blue in color. The maximum absorbance is expected to occur in what wavelength range? 500-560 nm (green) 380-435 nm (violet) 610-750 nm (red) 580-595 nm (yellow) 435-480 nm (blue)2. Discuss the different factors that affect the absorbance of a solution.What is the percent transmittance of a sample of light that has an absorbance of 0.125? Three sig figs.
- You have two solutions of the same compound that are blue. one is very pale and the other is very intense. Absorbance of each solution was measured with a spectrophotometer at the same wave length at which the solution absorbs. (A) Which solution has the higher absorbance? (B) Which is the more concentrated solution?2. You add 10.00 ml of a 0.630 M methyl red solution to a 100.00 ml volumetric flask. You then add small volumes of sodium acetate and acetic acid solutions to adjust the pH, and then fill the 100 mL volumetric flask to the mark with deionized water. You then make a spectroscopic measurement and obtain absorbance values of 0.253 at 520 nm and 0.079 at 420 nm. What is the concentration of [HIn] in the solution. Remember to use M;V1 = M2V2 as the first step in the calculation process. Hint: see eq. 6 in the lab manual A$20, = 0.367 A520, = 0.010 A420, - 0.012 A420, = 0.275 O 4.30 x 102 O 0.430 O 4.18 x 102 O 0.4182. Calculate the absorbance value (A) for a solution that absorbs 68.5% of the light striking it. (Hint: What is the percent transmittance?)
- A student is testing a different concentration of Cu(SO4)2, but finds that his absorbance readings are too high for the instrument. What steps can he take to measure the absorbance accurately?The naphthalene molecule has a structure that corre- sponds to two benzene molecules fused together: H H | H. H H H The 7-electrons in this molecule are delocalized over the entire molecule. The wavelength of maximum absorption in the UV-visible part of the spectrum in benzene is 255 nm. Is the corresponding wavelength shorter or longer than 255 nm for naphthalene?1. What is the absorbance of a substance that has a transmittance of 68%?
- Rose bengal is a chromophore used in biological staining that has an absorption maximum at 559.1 nm and several other shorter wavelength absorption bands in the ultraviolet and visible regions of the spectrum when dissolved in ethanol. What is the energy difference, in kilojoules per mole, between the absorption maximum at 559.1 nm and a band at 321.7 nm? E = kJ/molWhat procedures are utilized in optical analysis to determine a solution's concentration based on colorimeter absorbance measurements?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.
