Data Sheet: Investigation of Nickel and Copper Coordination Complexes Part B: The Coordination Number of Ni* Mass of Ni(NO,),.6H,0 _ 2. 34 29 Volume of Deionized H,O 45.6 Concentration of Ni?* Solution Moles Ni?+ TRIAL # Initial Temperature Final Temperature greaction AHreaction- 20.50 21.62 21.62 22.64 22.64 23,58 4 23-58 24.45 24.45 25.25 25.25 26.00 7 26.00 26.15 8. 26.15 26.07 25.91 9 26.07 10 25.91 25.88 Average Bond Energy Coordination Number of Ni²+

Data Sheet: Investigation of Nickel and Copper Coordination Complexes Part B: The Coordination Number of Ni* Mass of Ni(NO,),.6H,0 _ 2. 34 29 Volume of Deionized H,O 45.6 Concentration of Ni?* Solution Moles Ni?+ TRIAL # Initial Temperature Final Temperature greaction AHreaction- 20.50 21.62 21.62 22.64 22.64 23,58 4 23-58 24.45 24.45 25.25 25.25 26.00 7 26.00 26.15 8. 26.15 26.07 25.91 9 26.07 10 25.91 25.88 Average Bond Energy Coordination Number of Ni²+

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

Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 14.17QAP

See similar textbooks

Similar questions

The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026). Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1
A 3.03-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows: Assume that the Co(II)-ligand chelate obeys Beer’s law, and calculate the percentage of cobalt in the original sample.
A protein binds a ligand with a KD value of 0.25 M. If you are at a ligand concentration of 0.63 M, what is the fraction bound? Please report your answer to two significant figures. There should be no units in your answer
Which statement is true regarding interligand charge-transfer (ICT or LL'CT) complexes? Group of answer choices In an ICT transition, an electron is promoted from a pi-acceptor ligand orbital to one on a pi-donor ligand ICT transitions are only observed for complexes that have tetrahedral geometries The metal center plays the most influential role an ICT transition For a given complex, the ICT molar absorptivity is at its maximum when the pi-donor and pi-acceptor ligands are co-planar
The concentration of iron in a solution can be determined using UV?Vis spectrophotometry by reacting the iron with 1.10-phenanthroline to produce a colored complex. The following data were obtained for a series of standard solutions of iron/1,10-phenanthroline complex measured in a 1.00 cm cell. Concentration (M) Absorption 0.50x10-4 0.109 1.0x10-4 0.218 2.0x10-4 0.436 3.0x10-4 0.656 4.0x10-4 0.872 a.Prepare a Beer’s law plot using the above data b.Calculate the concentration of an iron 1, 10-phenanthroline complex solution that has an absorbance of 0.317 c.Calculate the molar absorptivity of the iron/1, 10-phenanthroline complex
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)What is the effect on the reported concentration of iron in the sample if there is a trace impurity of Fe2+in the ammonium citrate?
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.)
Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm All the reactions in this multistep method are not fully understood. However, it was determined that there are 2 moles of cocaine in coordination compound measured in last step. If coordination compound is represented as “Scott” coordination compound, which of the following is correct “stoichiometric” factor to get mass of cocaine from mass of measured complex ? a.g (Scott coordination cpd) * MM (Scott coordination cpd) MM (cocaine) b.g (Scott coordination cpd) * 2 *MM (Scott coordination cpd) MM…
Sketch structure of Mo(DMe) Cl2 (NMe,)2 , thhen apply ean to this complex showing ligand analysis and oxidation state analysis
The observed absorption band of the M2 + ion in the electronic spectrum of the hexaakua complex is 7500 cm-1. How many kJ / mol is the crystal field cleavage of the tetraakua complex of the same ion? (h = 6,626x10-34Js, c = 3x108ms-1) A. 142.63 B. 25.95 C. 2698.56 D. 39.88 E. 3333.33
Explain why the complex [Fe(H2O)6]3+ has Do = 14,000 cm-1, while [Fe(H2O)6]2+ has Do = 9,350 cm-1.
You prepare a solution of protein and its ligand where the initial concentrations are [Protein] = 10 nM and [Ligand] = 10 nM. At equilibrium you measure the [PL] = 5 nM. If the protein - ligand association can be represented by: P + L <--> PL What is the dissociation constant (Kd) of the protein for the ligand under the solvent conditions you have chosen? a. 1 nM b. 0.2 nM-1 c. 5 nM d. 10 nM