Which of the following statement regarding EDTA titration is incorrect A. In indirect titration, the analyte can not be titrated against EDTA B. In normal direct titration, the color of the endpoint is from the metal-indicator complex C. In back titration, excess EDTA is titrated with another standard solution of a second metal ion D. In masking titration, the sample or the interference can be isolated by "masking"

Which of the following statement regarding EDTA titration is incorrect A. In indirect titration, the analyte can not be titrated against EDTA B. In normal direct titration, the color of the endpoint is from the metal-indicator complex C. In back titration, excess EDTA is titrated with another standard solution of a second metal ion D. In masking titration, the sample or the interference can be isolated by "masking"

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.25QAP

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Which of the following statement regarding EDTA titration is incorrect In back titration, excess EDTA is titrated with another standard solution of a second metal ion In normal direct titration, the color of the endpoint is from the metal-indicator complex In indirect titration, the analyte can not be titrated against EDTA In masking titration, the sample or the interference can be isolated by "masking"
A slightly lower result than expected is obtained in the titration of iodine with thiosulfate in the presence of CuI, the reason for this is the adsorption of iodine on the CuI solid. This problem can be solved with which of the following? A. With the formation of the partially dissolved CuSCN salt with the SCN- ion added to the environment B. The solution is boiled for 2-3 minutes and cooled C. by adding HCl solution D. By keeping it closed for 10 minutes in the dark
If the unknown consisted of co2+,fe2+, sr2+, and ni2+ which cation would completely complex with edta first?? second?? third?? Also what are the minimum pH values required for satisfactory titrations of the above metal cations?
Which of the following statements is true regarding permanganimetry? a) Permanganate solution can oxidize water which is catalyzed by the presence of manganese dioxide or manganese ion. b) The light pink endpoint color for permanganimetry tends to fade with time due to the catalytic reaction. c) Standardization of the permanganate titrant is carried out at elevated temperature with sodium oxalate. d) all of these e) none of these
When all of the calcium ions in the titrant is consumed, the EDTA will complex next with the indicator.(true or false) At the equivalence point, the indicator in the Mg-indicator complex is displaced by EDTA resulting in the release of the free indicator. (true or false)
2,5 ml volume has taken from an “hypothetic” solution which includes (3+) Sb and (3+) Fe and at the titration with 0.1004 N KMnO4, the wasted amount has found as 16,4 mL. The other 2,5 mL that has taken, has reduced with Zn after that, this 2,5 mL solution has titrates with the same KMnO4 solution solution and the wasted amount is 26,5mL. With these datas find the %concentrations of the ions at the solution.
If the pH became too low during the titration of unknown by EDTA, how would the titration reaction’s equilibrium is affected?
Write all the reactions involved in the Mohr's method, if an unknown solution containing chloride ions is titrated against silver nitrate solution. Suggest an indicator and what is its colourin the unknown chloride solution ? and Why is KSCN solution used as burette solution and not in conical flask in Volhard's method?
Which of the following statements about the indicators used in Edta titrations is false?A. The strength of the complex made with the metal ion should be less than the complex of the same metal with EDTA.B. Metal indicators are used to determine the turning point in complexometric titrations.C. They should form water-soluble colored chelate complexes with metals.D. The complex formation constant of the complex made with metal ions must be very low.
Explain why in Mohr's method neutral medium should be used in titration of AgNO3?
Advantages of potentiometric titrations over 'classical' visual indicator methods: (select the correct statement(s)). Can be used for colored, turbid or fluorescent analyte solution. Can be used if there is no suitable indicator or if the color change is difficult to visualize. Both answers 1 and 2 are correct
In compleximetric titration, why should the conditional formation constant between the indicator and the metal have a smaller value than the conditional formation constant between the titrant and the same metal ion?