and, respectIvtryb) +2, 0a) +3, -1c) +2, -2Q14: salenH2 ligand prepared bya) condensation of salicylaldehyde (1 equiv.) and ethylenediamine (1 equiv.)D) condensation of salicylaldehyde (1 equiv.) and ethylenediamine (2 equiv.)C) condensation of salicylaldehyde (2 equiv.) and ethylenediamine (1 equiv.)d) condensation of salicylic acid (2 equiv.) and ethylenediamine (1 equiv.)e) none of themfollowing proced

a) +3, -1 b) +2, U Q14: salenH2 ligand prepared by b) condensation of salicylaldehyde (1 equiv.) and ethylenediam c) condensation of salicylaldehyde (2 equiv.) and ethylenedia d) condensation of salicylic acid (2 equiv.) and ethylenediamin e) none of them a) of (1 ethylenediam b) of (1 ethylenediam

a) +3, -1 b) +2, U Q14: salenH2 ligand prepared by b) condensation of salicylaldehyde (1 equiv.) and ethylenediam c) condensation of salicylaldehyde (2 equiv.) and ethylenedia d) condensation of salicylic acid (2 equiv.) and ethylenediamin e) none of them a) of (1 ethylenediam b) of (1 ethylenediam

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter26: Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 26.30QAP

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The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)Use the data table below to prepare a calibration curve (absorbance versus concentration in ppm). Fit the data to straight line and find the equation for the straight line and the R2 value. (Hint: Think about what to do with the absorbance of the blank.)
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