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What are the equilibrium concentrations of all copper containing species in solution containing 0.02mM copper and 0.4mM free ethylene diamine? Assume that there is an excess of ethylene diamine in the system. Also do not consider mixed ligand complexes.
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- Although EDTA has, in its fully protonated form, four hydrogen atoms that can be lost, it is listed as a hexadentate ligand. Explain why this is the caseWhat following factor affect the stability constant of metal complexes? equilibrium concentration of the free metal ion temperature analytical concentration of the metal ion pH of the solutionZinc on forms a 1:1 complex with a ligand called triethylenetetraamine. The formation constant for this complex is 1012. Calculate the [Zn2+] in a 0.01 M solution of the complex.
- Fill in the blanks : (i) When a ligand has a two-complexing or donor group in its structure, it is said to be————— (ii) ___________are compounds whose colour changes when they bind to a metal ion. (ii) If you double the wavelength, you will observe. ________the energy. (iv) In_____________ titration, we monitor changes in absorbance during the titration to find out the equivalence point. (v) Two liquids are_____________ if they form a single phase when they are mixed in any ratio. (vi) The efficiency of Chromatographic Columns can be described by____________Equation.Application of Tanabe-Sugano diagram and how does it predict the color of a 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.)About the Alfred warner theory of complexation charge (all are correct except Select one: 1-the neutralized ionic complex with a counter ion leading to a non ionizable complex is known to have a secondary 2- the ionized complexes of cationic or anionic charge is known to be of primary or principle valence 3- the complex geometry/ shape is not related to the coordination number 4- each metal have a number of secondary valencies known as coordination numberScott 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. Which molar absorptivity will you use to calculate concentration of cocaine ? a.cocaine molar absorptivity b.cocaine -cobaltous thiocyanate complex molar absorptivity. c.HCl - cobaltous thiocyanate molar absorptivity d.cobaltous thiocyanate molar absorptivity
- Why is the pH of the medium important for the formation of chelated complexes between metal ions and ligands? Choose the best answer: Select one: a. Because the ligands give rise to acid-base reactions that influence the stability of the chelate b. Because if the pH is not very acidic, the ligands do not protonate and the complex cannot form c. Because the pH of the medium is always important for any type of reaction. d. Because in the absence of pH there is no reaction of any kindIf given the choice of a complexometric titrant among the choices below, which would be the best option, and why? Unidentate ligands, because they form more stable complexes with metal ions Bidentate ligands, because they form more stable complexes with metal ions Tridentate ligands, because they form more stable complexes with metal ions Hexadentate ligands, because they form more stable complexes with metal ionsAssociation reaction is less preferable than dissociation reaction in forming an octahedral complex especially for late transition metals because
