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It is a common practice to prepare buffer of different pH values from a single acid. Select a single suitable acid and prepare maximum possible solutions having dissimilar ph's thereby explaining procedure of preparation of buffer

It is a common practice to prepare buffer of different pH values from a single acid. Select a single suitable acid and prepare maximum possible solutions having dissimilar ph's thereby explaining procedure of preparation of buffer

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 120AE
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I have solved this equation and seen solutions to it. However, I keep seeing Pb2+ squared in the Nernst Equation (for Q) for the calcuation of the second part of this question. I do not understand why Pb2+ is squared. Can you explain that to me? Thank you.

A galvanic cell is constructed in which the overall reac- tion is Pb(s) + 2 H;O* (aq) → Pb²+ (aq) + H2 (g) + 2 H20(e) (a) Calculate AE° for this cell. (b) Chloride ions are added until PbCl, precipitates at the anode and [CI-] reaches 0.15 M. The cell potential is then measured to be 0.22 V at pH = 0 and PH, 1.0 atm. Calculate [Pb2+] under these conditions. (c) Calculate the solubility product constant Kp of PbCl2.
Transcribed Image Text:A galvanic cell is constructed in which the overall reac- tion is Pb(s) + 2 H;O* (aq) → Pb²+ (aq) + H2 (g) + 2 H20(e) (a) Calculate AE° for this cell. (b) Chloride ions are added until PbCl, precipitates at the anode and [CI-] reaches 0.15 M. The cell potential is then measured to be 0.22 V at pH = 0 and PH, 1.0 atm. Calculate [Pb2+] under these conditions. (c) Calculate the solubility product constant Kp of PbCl2.
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