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List the advantages and disadvantages of a potentiometric titration relative to a direct potentiometric
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- Which are TRUE for the use of indicators with dichromate? I Dichromate is orange and changes color to green when reduced. The color change is abrupt enough to serve as an indicator.II The equivalence point for dichromate can be determined using Pt and calomel electrodes.III Dichromate end points are determined using the distinct color changes of diphenylamine sulfonic acid or diphenylbenzidine sulfonic acid indicators.IV In basic solution, the orange dichromate solution changes color to yellow when reduced to chromate anion. The color change is abrupt enough to serve as an indicator. A. I and III B. II and III C. I and IV D. II and IV E. I, II, and IV6. The quantitative determination of pyridoxine hydrochloride can be carried out by methods: A. Complexometry B. Argentometry C. Alkalimetry D. Acid-base titration in a protogenic solvent medium E. Acid-base titration in a profile solvent mediumWhat is the function of masking agent in EDTA titration?
- All of the following criteria must be met for a titrimetric analysis to be feasible EXCEPT: Select one: a. Reaction between the standard and analyte must be known. b. There should be a substance for endpoint detection c. Reaction must proceed quantitatively to completion. d. Reaction between the reactants must be slow.Why was sodium acetate added to the centrifugate for chromate ion determination?Which of the following experiments can be described as a displacement titration? A. Calcium in powdered milk is determined by dry ashing a 1.50 g sample and then titrating the calcium with 12.1 mL of 0.008949 M EDTA. B. The Tl in a 9.57-g sample of rodenticide was oxidized to the trivalent state and treated with an unmeasured excess of Mg/EDTA solution. The reaction is Tl3+ + MgY2- -> TlY- + Mg2+ Titration of the liberated Mg2+ required 12.77 mL of 0.03610 M EDTA. C. A 3.650-g sample containing bromide was dissolved in sufficient water to give 250.0 mL. After acidification, silver nitrate was introduced to a 25.00-mL aliquot to precipitate AgBr, which was filtered, washed, and then redissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) -> 2Ag(CN)2- + Ni2+ + 2Br- The liberated nickel ion required 26.73 mL of 0.02089 M EDTA. D. A solution contains 1.569 mg of CoSO4 (155.0 g/ mol) per milliliter. 50.00 mL of 0.007840 M EDTA…
- Discuss the role of indicators for the titration procedure *In the Assay of Sodium Chloride, what is the purpose of adding nitric acid in the solution? It is used to prevent precipitation of silver as carbonate It is used to hasten chemical reaction It is used to precipitate silver bromide It is used to form a film over silver nitrate precipitate What is the permanent color expected at the end point in the standardization of 0.1 N Ammonium Thiocyanate? * Orange red Blue Red Yellow In the Standardization of 0.1 N Silver Nitrate, what is the purpose of allowing the mixture to stand in the dark? * It is used to aid in the formation of precipitate with large particles It is used to prevent the production of free silver It is used to acquire a purplish color in the precipitate It is used to maximize the reduction of silver chloride In the standardization of 0.1 N Silver Nitrate, what is the most suitable temperature to dry the Silver Chloride precipitate to constant weight? * 115° C 110° C 100° C 120° C Which is NOT…Chemistry Potentiometry Topic Briefly discuss the following: 1.different types of membrane indicator electrode 2.how a pH glass electrode works 3.errors encountered in the use of pH electrode 4.contribution of other variables in the glass indicator potential
- The mass percent of Fe in an unknown salt sample was determined using both volumetric and gra vimetric titration. Ten determinations using both methods were performed. Volumetric(% of Fe): 24.22, 23.86, 24.07, 24.49, 24.69, 23.71, 24.28, 24.11, 24.26, 24.10 Gravimetric (% of Fe): 24.35, 24.26, 24.10,24.19, 24.18, 24.32, 24.11, 24.33, 24.17, 24.12 a. Do the two methods give similar standard deviations? b. Do the two methods give similar results for the mass percent of Fe at the 95% confidence level?The Kjeldahl procedure was used to analyze 244 µL of a solution containing 38.1 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.0375 M HCl and the remaining acid required 5.98 mL of 0.00998 M NaOH for complete titration. What is the weight percent of nitrogen in the protein?Since EDTA titration must be done at pH 10, which procedure will help in removing the HCl in the CaCO3 preparation step? Dehydration of HCl at hot plate Simply add buffer 10 solution Filter the solution with asbestos filter pad Neutralize the solution with NaOH pellet and filter