(d) Heat on a Kjeldahl burner in a hood until white SO3fumes form.(e) Cool, add 25 ml of deionized water, and filter quan-titatively into a 100-ml volumetric flask. Dilute tovolume.(f) Prepare iron standards with concentrations of 2, 4, 6,8, and 10 mg/1.(g) Install an iron hollow cathode lamp in your atomicabsorption spectrometer and turn on the instrumentand adjust it according to instructions in the operatingmanual.(h) Run your standards and each of your ashed samplesand record the absorbances.Calculate the iron concentration in each of your replicates,express as mng Fe/lb flour.Table. Absorbance data for iron standards and flour samplesFe Conc.CorrectedSample(mg/L)AbsorbanceAbsorbanceReagent BlankStandard 10.012.00.220.21Standard 24.00.400.39Standard 36.00.630.62Standard 48.00.790.78Standard 5Flour Sample 1Flour Sample 2Flour Sample 310.01.031.02?0.280.270.280.250.29?0.26 1. Your company manufactures and markets an enrichedall-purpose flour product. You purchase a premix con-taining elemental iron powder, riboflavin, niacin, thi-amin, and folate which you mix with your flour duringmilling. You specified to the supplier that the premixbe formulated so that when added to flour at a spec-ified rate, the concentration of added iron is 20mg/lbflour. However, you have reason to believe that the ironconcentration in the premix is too low so you decideto analyze your enriched flour using your new atomicabsorption spectrometer. Current FDA guidelines forenriched flour specify that the iron concentration shouldbe 20 mg/lb: http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=137.165 (accessed6/18/2009). You follow the following protocol to deter-mine the iron concentration.(a) Weigh out 10.00 g of flour, in triplicate (each replicateshould be analyzed separately).(b) Transfer the flour to an 800-ml Kjeldahl flask.(c) Add 20ml of deionized water, 5ml of concentratedH,SO4, and 25 ml of concentrated HNO3

Absorbance of a substance is proportional to its concentration and path length (width of cuvette) by…

Table. Absorbance data for iron standards and flour samples Fe Conc. (mg/L) Corrected Sample Absorbance Absorbance Reagent Blank Standard 1 0.01 2.0 0.22 0.21 Standard 2 4.0 0.40 0.39 Standard 3 6.0 0.63 0.62 Standard 4 8.0 0.79 0.78 Standard 5 Flour Sample 1 Flour Sample 2 Flour Sample 3 10.0 1.03 1.02 0.28 0.27. 0.29 0.28 0.26 0.25

Table. Absorbance data for iron standards and flour samples Fe Conc. (mg/L) Corrected Sample Absorbance Absorbance Reagent Blank Standard 1 0.01 2.0 0.22 0.21 Standard 2 4.0 0.40 0.39 Standard 3 6.0 0.63 0.62 Standard 4 8.0 0.79 0.78 Standard 5 Flour Sample 1 Flour Sample 2 Flour Sample 3 10.0 1.03 1.02 0.28 0.27. 0.29 0.28 0.26 0.25

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.40QAP

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Solid potassium sulfide is slowly added to 150 mL of a 0.277 M nickel(II) iodide solution until the concentration of sulfide ion is 0.0269 M. The percent of nickel ion remaining in solution is %. 20 Submit Answer $ 4 R F M 07 20 Retry Entire Group % 5 [Review Topics] [References] Use the References to access important values if needed for this question. T Cengage Learning Cengage Technical Support G ^ 6 8 more group attempts remaining D MacBook Pro Y H & 7 N U * 00 8 J I M 69 K O ) 0 < A L P A Previous Next Email Instructor { Save and Exit ~4 ? 1
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+ H (a) CuCN (b) CaCO3 (c) Ag₂CO3 (d) PbBr₂ (e) Y(OH)3 Periodic Table B W Chapter... Supporting Materials Additional Materiala [Ca²+] = 5.2 x 104 M, [CO32- ] = 6.5x 10-6 M * G Please use the values in the resources listed below instead of the textbook values. The following concentrations are found in mixtures of ions in equilibrium with slightly soluble solids. From the concentrations given, calculate Ksp for each of the slightly soluble solids indicated. [Cu] = 1.9x10-10 M, [CN] = 1.9x10-¹0 M [Ag+] = 1.8x10-5 M, [CO32] = 2.7x10-² M [Pb²+] = 1.2x 10-2 M, [Br] = 2.4x10-2 M [Y³+] = 3.5x 10-16 M, [OH-] = 6.6x 10-³ M Constants and Factors №. webassign.net ● F 893 Supplemental Data L C C a Ⓒ + D r
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prelab2/3: please see attached wavelength is: 475 nm for blue light.
How to write the reaction of the analyte with the reagent? Alert for not submit AI generated answer. I need unique and correct answer. Don't try to copy from anywhere. Do not give answer in image formet and hand writing
Draw a schematic diagram using this information. Preparation of the solution Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves. Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly. Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate. Filtration of the solution Take a funnel and fix a filter paper in it and clamp it to a stand. Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out. Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue. Concentration of the filtrate to crystallisation point Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. To…
Analytical
In the determination of iron in fortified cereals by atomic absorption, 0.9133 g of sample was weighed. After a previous treatment, it was dissolved and diluted to 100 mL, an aliquot of 25.0 mL was taken, this was diluted to 100 mL and this solution presented an absorbance reading of 0.251. A series of iron standards of the following concentrations were prepared: 0.0; 1.0; 2.0; 2.5 and 3.0 ppm. Whose absorbances were 0.0; 0.241; 0.405; 0.520 and 0.640. Determine the iron concentration in mg/100 g of sample.
You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4 . The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. Determine the dosage strength of the product in terms of % Mg(OH)2 content. Type your answer in 2 decimal places, numbers only.
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