Which of the following statements is false? EDTA acts as a Lewis base while the metal analyte acts as a Lewis acid during titration pH must not exceed 10 because the analyte may form its hydroxide which will form a precipitate The Kf of EDTA analyte complex must be larger than the EDTA indicator complex The smaller the Kf the larger the sharpness of the end point of the titration curve

Which of the following statements is false? EDTA acts as a Lewis base while the metal analyte acts as a Lewis acid during titration pH must not exceed 10 because the analyte may form its hydroxide which will form a precipitate The Kf of EDTA analyte complex must be larger than the EDTA indicator complex The smaller the Kf the larger the sharpness of the end point of the titration curve

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.35QAP

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The titration of Zn+2 and EDTA is carried out in the same manner as Mg2+ - EDTA titration (in fact, Zn metal may be used to standardize your EDTA solution). In this case, the ammonia from the pH 10 buffer serves and additional purpose other than the deprotonation of EDTA. What is it? pH 10 buffer is made with 57 mL of concetrated NH3 (or NH4OH) and 7 g of NH4Cl and diluted to 100 mL with DI water
In order to adjust the EDTA solution, 10 mL of 0.01M Ca + 2 sample was taken and 10 mL of pH 10 buffer was added on it and it was completed to 100 mL. Then, two drops of EBT indicator were added and titrated with EDTA. Since the consumption is 13 mL, what is the concentration of EDTA solution in terms of molarity?
50 mL of a sample known to contain Mg+2 was taken and titrated with 0.075 M EDTA standard solution by adding pH 10 buffer and EBT indicator. Since the EDTA consumption is 10.5 mL, which of the following is the magnesium amount in the sample in ppm? (Mg:24 g/mol)
In order to adjust the EDTA solution, 10 mL of 0.01M Ca + 2 sample was taken and 10 mL of pH 10 buffer was added on it and it was completed to 100 mL. Then, two drops of EBT indicator were added on it and titrated with EDTA. Since the consumption is 13 mL, which of the following is the concentration of the EDTA solution in terms of molarity? A. 0.0076B. 0.0101C. 0.0067D. 0.0111
The amount of calcium in physiologic fluids can be determined by a complexometric titration with EDTA. In one such analysis, a 0.100-mL sample of blood serum was made basic by adding 2 drops of NaOH and titrated with 0.00528 M EDTA, requiring 0.233 mL to reach the end point. Report the concentration of calcium in the sample as miligrams of Ca per 100 mL. (Ca = 40.078 amu).
For the complexometric titration of Ca (II) ions in the shell of the egg sample weighing 59.427 g, the necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL was taken from the prepared sample, diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The solution prepared was titrated with 27.4mL of 0.0097 M EDTA solution. Calculate the amount of calcium in the sample in terms of% CaCO3. (Ca = 40 g / mol, CaCO3 = 100g / mol) A. 4.47 B. 8.95 C. 3.58 D. 5.83
1. Which of the following metal ions could be determined using EDTA titration at pH 2.0? a. Fe3+ b. Ca2+ c. Ag+ d. Mg2+ 2. Which of the following is not an indicator for EDTA titration? a. Calmagite b. Murexide c. Maleic acid d. Eriochrome black T
The following statements are ways to mitigate EDTA titration's low sensitivity EXCEPT A. Buffer at specific pH to avoid other metal ions to complex with EDTA B. Use of masking agents to react with other cations C. Using higher concentration of EDTA titrant D. Use of optimal form of EDTA that will complex with the target metal ion/s E. None of the choices.
In a Complexometric Titration Experiment, the preparation of the EDTA solution is as follows: In a 250 mL beaker, weigh 0.10 g MgCl2*6H2O and 1.0 g NaOH. Add approximately 200 mL distilled water and stir to dissolve. Add about 2.0 g of EDTA and transfer the solution quantitatively to a 1-L volumetric flask. Dilute to the mark with distilled water. What is the purpose of adding MgCl2*6H2O? Please show COMPLETE solution.
4.50 mL of 0.1 M Ca2+ ion was titrated at pH 10 with 0.1 M EDTA. What will be the concentration of Ca2+ ions in the solution when 25 mL, 50 mL and 75 mL EDTA is added(a4 = 0.35, Kf = 5.0x1010)?
why Mg (II) must be added when EDTA is standardized using acalcium standard solution and Eriochrome Black T as indicator.
For the complexometric titration of Ca (II) ions in the shell of the egg sample weighing 59.427 g, necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL of the prepared sample was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The solution prepared was titrated with 27.4mL of 0.0097 M EDTA solution. Calculate the amount of calcium in the sample in terms of% CaCO3. (Ca = 40 g / mol, CaCO3 = 100g / mol)