What is the purpose of an auxiliary complexing agent?O to attach to a metal ion through more than one ligand atomto protect some component of the analyte from reacting with EDTAO to change color when bound to a metal ionO to weakly bind to a metal, preventing the metal hydroxide from precipitating in a basic solution during an EDTAtitration

In EDTA tritration is to weakly bind to a metal, preventing the metal hydroxide from precipitating…

Answered: What is the purpose of an auxiliary…

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

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Chapter9: Complexometric And Precipitation Titrations

Section: Chapter Questions

Problem 1P

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Ethylenediaminetetraacetate (EDTA4 ) is used as a complexing agent in chemical analysis with the structure shown in Fig. 21.7. Solutions of EDTA4 are used to treat heavy metal poisoning by removing the heavy metal in the form of a soluble complex ion. The complex ion virtually prevents the heavy metal ions from reacting with biochemical systems. The reaction of EDTA4 with Pb2+ is Pb2+(aq) + EDTA4(aq) iPbEDTA2(aq) K = 1.1 1018 Consider a solution with 0.010 mol of Pb(NO3)? added to 1.0 L of an aqueous solution buffered at pH = 13.00 and containing 0.050 M Na1EDTA. Does Pb(OH)2 precipitate from this solution? [Ksp for Pb(OH)2 = 1.2 1015.
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.
1) What role do the protons play in the transformation of [(SALEN)VO] to [(SALEN)Cl2]? --- Consider the number of anionic charges for all the ligands as well as the charge of the overall complex. Has the oxidation of vanadium changed in this reaction?
copper complex crystallises straightaway when synthesising but the cobalt complex required the solution to be concentrated and cooled before it is filtered to obtain product. what does this tell you about the realtive solubilities of the copper and cobalt complexes.
How did Werner first explain bonding in complexes Tetraaminecarbonatocobalt(III) nitrate and pentaamminechlorocobalt(II)chloride
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 What reaction occurs when HCl is added to dissolve the precipitate ? a.Lewis acid- Lewis base reaction b.Lewis acid- Bronsted Lowry base reactionc.Bronsted Lowry acid – Bronsted Lowry base reaction d.Arrhenius acid – Arrhenius base reaction
Cadmium is an interferant because it forms a precipitate with o-phenanthroline. What effect would the formation of a Cd-o-phenanthroline precipitate have on thedetermination of the parts per million of Fe in a sample?
A sample contains Pb2+, Mg2+ and Zn2+. 0.4085 g of the sample is weighed and dissolved. Once dissolved it is with cyanide to form a complex and mask the zinc (Zn2++ 4 CN-→ Zn (CN)4 2-). The Pb2+ and Mg2+ in the solution are titrated with 42.22 mL of EDTA 0.02604 M. Then the Pb complex is treated with another organic ligand that masks Pb and releases EDTA, which is titrated with 19.35 mL of a Mg2+ 0.007657 M solution. For finalize formaldehyde is added to unmask the Zn2+(Zn (CN)4 2- + 4 HCHO + 4 H2O → Zn2+ + 4 HOCH2CN + 4 OH-). The liberated zinc is titrated with EDTA 0.02064 M consuming 28.63 mL. (Data: Pat Pb, 207.22; Pat Mg, 24.31; Pat Zn, 65.4). Find the percentage of the three metals in the sample.
(a) A compound with formula RuCl3 . 5 H2O is dissolved inwater, forming a solution that is approximately the samecolor as the solid. Immediately after forming the solution,the addition of excess AgNO3(aq) forms 2 mol of solid AgClper mole of complex. Write the formula for the compound,showing which ligands are likely to be present in the coordinationsphere. (b) After a solution of RuCl3 . 5 H2O hasstood for about a year, addition of AgNO3(aq) precipitates 3mol of AgCl per mole of complex. What has happened inthe ensuing time?
1) a)Draw structure and the crystal field splitting diagram for this complex ion. [trans-disquatetrachlorocuprate(II) ion] b) Explain why hexofluorocopper (II) ion has a distorted octahedral grometry. c) Draw the structure and the crystal field splitting diagram for hexofluorocopper (II) ion.
MATCHING TYPE. Write the letter after the statement that matches the description. Choices: A. Complex Chelate B. Chelating agent C. EDTA D. Masking Porphine Titration E. Thioglycols Ligand Term used to indicate the determination of a metal in the presence of another metal Substance whose molecules can form several bonds to a single metal ion The product of a complexation reaction is known as the? Added to certain canned foods to remove transition- metal ions that can catalyze the deterioration of the food Inactivate metals such as Hg and Cu which react with the sulfhydryl groups thus allowing the titration of Zn at pH 6
A mixture of the 8-hydroxyquinoline complexes of Al and Mg weighed 1.0843 g.When ignited in a furnace open to the air, the mixture decomposed, leaving a residue of Al2O3and MgO weighing 0.1344 g. Find the weight percent of Al(C9H6NO)3 in the original mixture.

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