altons forFree Response QuestionsFRQ 1:0/5To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt andsome inert materials, solutions with known [Co?) are prepared and absorbance of each of thesolutions is measured at the wavelength of optimum absorbance. The data are used to create acalibration plot, shown below.0.90-0.80-0.700.600.500.40-0.300.20-0.10-0.00-0.0050.010Concentration (M)0.015A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is dilutedwith water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted toCo2+(aq).a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74?13✗b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.0.008 mols Co

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Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter10: Atomic Emission Spectrometry

Section: Chapter Questions

Problem 10.11QAP

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M (2022-23) Unit 1: Mole Concept, Unit 4 (FR) (Version 2) Assessment: Chemical Reactions 0.90 0.80- 0.70- 3 0.60 0.50- 0.40- 0.30- Absorbance 2. To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co²+] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.20 0.10- 0.00+ ㅏ 0.005 0.010 34 0.015 Concentration (M) .04 co₂ 100- pertoc A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co²+ (aq). (a) What is the [Co²+] in the solution if the absorbance of a sample of the solution is 0.74 ? (b) Calculate the number of moles of Co²+ (aq) in the 50.00 mL solution. (c) Calculate the mass percent of Co in the 0.630 g sample of the ore. Answer…
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