Prepare standard solutions for the spectrophotometric measurement of iron in anunknown solution. The first standard solution includes 250 mg/L of pure iron within100 mL solution. Make a serial dilution by pipetting 60 mL of the first standard andthe last standard solution will contain 19,44 mg/L of pure iron.www www ww wmwwwwwww wwwm wwwa. Complete number of standards and indicate concentration of each standard solution.wwwwwwww wwwww vww vwwwwwwww vw ww m w m wwSTD-XSTD-1(19,44 mg L)(250 mg L)b. If the standard curve equation is given as y=2548X-654, calculate the ironconcentration of a solution that has a 0,898 absorbance value at 525 nm wavelength.wwwwww wwww

Serial dilution refers to stepwise dilution by keeping the dilution factor constant. Dilution factor…

Prepare standard solutions for the spectrophotometric measurement of iron in an unknown solution. The first standard solution includes 250 mg/L of pure iron within 100 mL solution. Make a serial dilution by pipetting 60 mL of the first standard and the last standard solution will contain 19,44 mg/L of pure iron. wwm www wm ww m m wwww.v wwww wwww a. Complete number of standards and indicate concentration of each standard solution wwww ww wwwwww wwm w STD-X STD-1 (250 mg L) (19,44 mgL) b. If the standard curve equation is given as y=2548X-654, calculate the iron concentration of a solution that has a 0,898 absorbance value at 525 nm wavelength. wwww v

Prepare standard solutions for the spectrophotometric measurement of iron in an unknown solution. The first standard solution includes 250 mg/L of pure iron within 100 mL solution. Make a serial dilution by pipetting 60 mL of the first standard and the last standard solution will contain 19,44 mg/L of pure iron. wwm www wm ww m m wwww.v wwww wwww a. Complete number of standards and indicate concentration of each standard solution wwww ww wwwwww wwm w STD-X STD-1 (250 mg L) (19,44 mgL) b. If the standard curve equation is given as y=2548X-654, calculate the iron concentration of a solution that has a 0,898 absorbance value at 525 nm wavelength. wwww v

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter27: Molecular Fluorescence Spectroscopy

Section: Chapter Questions

Problem 27.13QAP

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Using a 10mL pipette, you prepare a standard solution by pipetting 10.00mL of the standard iron solution [0.25g/L] into a 100mL volumetric flask. Then, using a 25mL pipette you transfer a 25mL aliquot of this solution into a 250mL volumetric flask and dilute up to the mark. Calculate the % uncertainty
Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty.
A spectrophotometric method for the quantitative determination of the concentration ofPb2+ in blood yields an Ssamp of 0.133 for a 1 mL sample of blood that has been diluted to 6 mL. A second sample is spiked with 1 µL of a 1467 ppb Pb2+ standard and diluted to 6 mL, yielding an Sspike of 0.491. Determine the concentration of Pb2+ in the original sample of blood.
Lead in dry river sediment was extracted with 25 wt% HNO3 at incubation temperatures for 1 hr. Then 1 mL of filtered extract was combined with other reagents to a total of 4.60 mL. Pb+2 was measured by an electrochemical method by spiking with 2.50 ppm Pb2+. added vol. of 2.50ppm Pb2 signal 0 mL 1.10 0.025 mL 1.66 .050 mL 2.20 .075 mL 2.81 what is Sx based on Sy
For Indirect Iodometric Analysis of Copper... ~0.0896g KIO3 necessary to consume 350mL of 0.1 M Na2S2O3, Na2S2O3 is stored in an amber glass bottle until ready for use. Primary Standard KIO3 has 2g of KI, 50mL of DI water, and 10 mL of 1.0M HCl is added then immediately titrated with Na2S2O3 until medium yellow or straw... then 5mL of starch indicator is added and titrated again until blue black color turns clear. Unknown CuO use 1.2G of Unknown, 20mL of HNO3 heated until sample dissolved, 25 mL of DI water added and boiled until clear light blue color, after cooling 1:1 NH3 added (~34.47 mL of NH4OH reagent) until permanent deep blue color amine complex, 2g of NH4HF2 added and swirled until dissolved, 3 g of KI is added then titrated immediately with Na2S2O3 until brown color of iodide is nearly gone (brown milk color), 2 g of KSCN and 3 mL of starch indicator is then added with titration continuing until disappearance of new blue black color. 1. Na2CO3 is often added to thiosulfate…
For Indirect Iodometric Analysis of Copper... ~0.0896g KIO3 necessary to consume 350mL of 0.1 M Na2S2O3, Na2S2O3 is stored in an amber glass bottle until ready for use. Primary Standard KIO3 has 2g of KI, 50mL of DI water, and 10 mL of 1.0M HCl is added then immediately titrated with Na2S2O3 until medium yellow or straw... then 5mL of starch indicator is added and titrated again until blue black color turns clear. Unknown CuO use 1.2G of Unknown, 20mL of HNO3 heated until sample dissolved, 25 mL of DI water added and boiled until clear light blue color, after cooling 1:1 NH3 added (~34.47 mL of NH4OH reagent) until permanent deep blue color amine complex, 2g of NH4HF2 added and swirled until dissolved, 3 g of KI is added then titrated immediately with Na2S2O3 until brown color of iodide is nearly gone (brown milk color), 2 g of KSCN and 3 mL of starch indicator is then added with titration continuing until disappearance of new blue black color. 4. Why is the starch indicator solution…
A standard of solution was put through appropriate dilutions to give the concentrations of glucose (mM) shown in the accompanying table. The absorbances in the table (1.00-cm cells) were recorded at 490 m table. Use the method of least squares to find an equation relating absorbance and the concentration of glucose.
The determination of iron in wines was carried out by atomic absorption spectrophotometry, using the standard addition method. To do this, 10 mL of wine were placed in five 50 mL volumetric flasks; then 0, 5, 10, 15 and 20 mL of a 10 ppm iron standard solution were added to each of them. Next, they were gauged with distilled water and the absorbance was measured, obtaining the values of 0.040, 0.062, 0.081, 0.102 and 0.125 respectively. Calculate the regression parameters and obtain the iron concentration in the wine, in µg / mL.
Calculate the estimated O2 cost of horizontal treadmill running (ml · kg−1 · min−1) for a 70-kg subject at 150, 200, and 235 m · min−1.
You created a standard curve and calculated the slope to be 66.41. After synthesizing your copper network, you weighed 0.052 grams of your copper product, worked it up with nitric acid, buffer, and ammonia and added it to a 25 mL volumetric flask. Then, you measured the absorbance of your solution and received a value of 0.29. What is the % mass of copper in your product?
A 0.500g sample is analyzed spectrophotometrically for manganese by dissolving it in acid and transferring to a 250 mL flask and diluting to volume. Three aliquots ae analyzed by transferring 50 mL portions with a pipet to 500 mL Erlenmeyer flask and reacting with an oxidizing agent, potassium peroxydisulfate, to convert the manganese to permanganate. After reaction, these are quantitatively transferred to 250 mL volumetric flasks, diluted to volume and measured spectrophotometrically. By comparison with standards, the average concentration of the final solution is determined to be 1.25 x 10^-5M. What is the percent manganese in the sample?
A sample of iron ore weighing 800 mg was treated with HNO3 , boiled to dryness and redissolved in dilute HCl. After filtration and removal of undissolved silica, the liquid was passed through a Walden reductor. The collected sample was titrated with 0.0210 M KMnO4 , requiring 12.0 mL to reach the end point. Calc %Fe (55.845) in the ore.