The formation constant (Kf) for calcium reacting with EDTA is 6.2 x108. A calcium-EDTA titration was done at a pH = 10.00, where the fraction of species of Y is approximately 0.39, what would be the value for the conditional formation constant (Kf') for the reaction? 1.0 x 1010 O 6.2 x 108 O 4.5 x 1011 O 2.4 x 108

The formation constant (Kf) for calcium reacting with EDTA is 6.2 x108. A calcium-EDTA titration was done at a pH = 10.00, where the fraction of species of Y is approximately 0.39, what would be the value for the conditional formation constant (Kf') for the reaction? 1.0 x 1010 O 6.2 x 108 O 4.5 x 1011 O 2.4 x 108

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.20QAP

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. An antacid tablet, weighing 1.25 g, was dissolved in a 1.0 L volumetric flask to allow for determination of calcium carbonate and magnesium carbonate contents. After preparing the solution, an aliquot of 10.0 ml was transferred to an Erlenmeyer flask containing a buffer solution with pH = 10. This aliquot was then titrated with EDTA 0.0040 mol/L and the average volume spent was 15.01 mL. To measure calcium after precipitation. After the magnesium was fractionated, a second 10.00 mL aliquot of the stock solution was transferred to an Erlenmeyer flask, and the pH of the present solution was adjusted to a value of approximately 13. In EDTA titration, the volume consumed for observation of the end point was equal to 13.03 mL. Based on this information, a) Outline the two steps involved, representing the related reactions./5 b) Calculate the concentrations of CaCO3 and MgCO3 present in the initial solution./6 c) Calculate the masses of CaCO3 and MgCO3 present in the pellet./6 d) Calculate…
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