a. What is the structure and full name for EDTA? b. The titration of Zn^+2 and EDTA is carried out in the same manner as the Mg^+2 * 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 an additional purpose. What is it? c. Although EDTA has, in its fully protonated form, 4 hydrogen atoms that can be lost, it is listed as a hexadentate ligand. Explain why this is the case.

a. What is the structure and full name for EDTA? b. The titration of Zn^+2 and EDTA is carried out in the same manner as the Mg^+2 * 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 an additional purpose. What is it? c. Although EDTA has, in its fully protonated form, 4 hydrogen atoms that can be lost, it is listed as a hexadentate ligand. Explain why this is the case.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.33QAP

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4. A 50.0 mL solution of 0.100 M Zr* is buffered to pH=5 and titrated with 0.150 M EDTA. a. EDTA titrations are usually carried out at super high pHs. Why is it less important to do that with this one? b. Even though it's not at a high pH, the solution is still buffered. Why? c. What is pZr** at the equivalence point? Does that number make sense?
50.00 mL of 0.0524 M Pb(NO3)2 is titrated with 0.0419 M EDTA. The pH is buffered to 8.57. Find the following concentrations, [EDTA], [Y-4], [PbY-2] and [Pb+2], at each of the points described below. A. After 30.00 mL of EDTA has been added. B. At the endpoint. C. After 70.56 mL of EDTA has been added.
The titration of Zn+2 and EDTA is carried out in the same manner as the Mg+2-EDTA titration. In this case, the ammonia in the EDTA buffer serves an additional purpose, what is it?
A 50.00 mL aliquot of standard CaCO3 (0.3834g CaCO3 per liter) consumed 42.35 mL of EDTA solution. The same EDTA standard solution was used for the titration of a 3.00 mL water sample. This required 30.56 mL of the titrant. Calculate the molar concentration of EDTA standard solution. What is the total hardness of water sample (then after solving explain how it come up to the final answer.)
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
Consider the titration of 25.0mL 0.020M of Co(NO3)2 with .0100M EDTA in a solution buffered to pH 10.00. Calculate pCo^2+ at the following volumes of added EDTA. a. 0.0 mL b. 20.0 mL c. 40.0 mL d. 49.0 mL e. 50.0 mL f. 50.1 mL g. 55.0 mL h. 60.0 mL
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3. A 50.00 mL solution containing Ni2+ and Fe2+ was treated EDTA to bind all the metal ions. After back-titration, the amount of EDTA used is 2.500 mmol. In another 50.00 mL solution was added pyrophosphate to mask the Fe2+ ions, and the solution required 25.00 mL of 0.04500 M EDTA. Calculate the ppm Fe (55.85 g/mol) in the solution.
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