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- Which of the following statements is true regarding the iron-phenanthroline method? I. Any wavelength of radiation can be utilized with no change in the results. II. Blank correction must be performed to account for any absorbing species other than the analyte in the solution. III. This method can be used to discriminate and quantify the Fe3+ and Fe2+ content in the sample. II and III I and II III only II only10. Potentiometric methods can be used for end-point detection in EDTA titration of metal ions for which ion electrodes are available 11. Back titrations are useful for determining cations that are able to form stable EDTA complexes. 12. Nitriloacetic acid is an aminopolycarboxylic acid. 13. A ligand that has a single donor group is unidentate such as glycine. 14. Ammonia is a bidentate ligand. 15. The term chelate is derived from a Greek word meaning, toothlike projectionsFor each of the following experiments, try to identify the major probable sources of random and systematic errors, and consider how such errors may be minimized: 1. The iron content of a large lump of ore is determined by taking a single small sample, dissolving it in acid, and titrating with ceric sulphate after reduction of Fe (III) to Fe (II). 2. The same sampling and dissolution procedure is used as in (a) but the iron is determined colorimetrically after addition of a chelating reagent and extraction of the resulting colored and uncharged complex into an organic solvent. 3. The sulphate content of an aqueous solution is determined gravimetrically with barium chloride as the precipitant.
- Explain whether or not it will result in a usable standard solution, and why. (Assume appropriate counterions are chosen that do not interfere with the chemistry or spectroscopy.) For any procedure that does work, what is the molarity of FeSCN+2 complex? 0.500 moles of Fe+3 and 0.00500 moles of SCN-1 in 1.0 L of water.Which of the following is/are true regarding instrumental methods of analysis? a. these methods have higher precision compared to chemical b. these methods have lower throughput compared to classical c. these methods can measure lower analyte concentration than classical d. all of the aboveAssess the validity of each statement and choose X if the statement is CORRECT, Choose Y if otherwise. 10. Potentiometric methods can be used for end-point detection in EDTA titration of metal ions for which ion electrodes are available 11. Back titrations are useful for determining cations that are able to form stable EDTA complexes. 12. Nitriloacetic acid is an aminopolycarboxylic acid. 13. A ligand that has a single donor group is unidentate such as glycine. 14. Ammonia is a bidentate ligand. 15. The term chelate is derived from a Greek word meaning, toothlike projections
- 25.00 mL 0.01000 M Ni2+ is titrated with 0.01000 M EDTA in a solution buffered to pH 5.0. Given that the formation constant for the Ni-EDTA (NiY2–) chelate is 4.2 x 1018 and the 4 value at pH 5.0 is 3.54 x 10–7 Calculate the approximate transition range of this indicator when used in the titration of Ni2+ with EDTA at pH 5.0.What is the theory of colorimetric determination of iron in the tap water sample?All of the following will generate reproducible but not accurate results except a. The analytical balance is not calibrated. b. The sample was not stirred well before getting aliquot for analysis. c. A blank was not used in calculation of concentration in a colorimetry experiment. d. The correction for quality of glass in pH probe is not included in calculation of pH.
- Please answer the following with complete solution. Thank you. A mixture placed in an Erlenmeyer flask comprises 6mL of silica gel and 40mL of a solvent containing, in solution, 100mg of a non-volatile compound. After stirring, the mixture was left to stand before a 10mL aliquot of the solution was extracted and evaporated to dryness. The residue weighed 12mg. Calculate the adsorption coefficient, K=CS/CM, of the compound in this experiment.2 The experiment is about Spectrophotometric Determination of the Formula of a Thiocyano Complex of Fe(III) and its Formation Constant. Taking into account that the [Fe(H2O)6]3+ complex may undergo hydrolysis, propose an explanation about the role of HNO3 in the experiment.Elaborate the reason why EDTA is used in many complexometric titrations. How will you be able to improve its selectivity when it comes to analyzing specific metals?