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Chemistry / Quantitative Chemical Analysis 8 / Chapter 14 / Problem 14-B

Quantitative Chemical Analysis | 8th Edition | ISBN: 9781429218153 | Authors: Daniel C. Harris

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The apparatus in the figure can follow the course of an EDTA titration and was used to

Chapter 14, Problem 14-B

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QUESTION:

The apparatus in the figure can follow the course of an EDTA titration and was used to generate the curves in Figure 11-10. The heart of the cell is a pool of liquid Hg in contact with the solution and with a Pt wire. A small amount of HgY2 added to the analyte equilibrates with a very tiny amount of Hg2: (A) The redox equilibrium is established rapidly at the surface of the Hg electrode, so the Nernst equation for the cell Hg2 2e Hg(l) Kf [HgY2] [Hg2][Y4] 1021.5 Hg2 Y4 HgY2 Pt wi

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QUESTION:

The apparatus in the figure can follow the course of an EDTA titration and was used to generate the curves in Figure 11-10. The heart of the cell is a pool of liquid Hg in contact with the solution and with a Pt wire. A small amount of HgY2 added to the analyte equilibrates with a very tiny amount of Hg2: (A) The redox equilibrium is established rapidly at the surface of the Hg electrode, so the Nernst equation for the cell Hg2 2e Hg(l) Kf [HgY2] [Hg2][Y4] 1021.5 Hg2 Y4 HgY2 Pt wi

ANSWER:

Step 1 of 6

Equation C, in which is the formation constant , yields the cell voltage. We must figure out and at each position in order to get the voltage. When V=0, the concentration of is , and it is then diluted because of . With the exception of the first point, the Mg-EDTA equilibrium may be used to determine the concentration of . The Hg-EDTA equilibrium establishes at V=0 mL.

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