Answered: Calculate the concentration of the zinc…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 105QAP: Consider a voltaic cell in which the following reaction occurs. Zn(s)+Sn2+(aq)Zn2+(aq)+Sn(s) (a)...

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Calculate the concentration of the zinc sulfate solution using the Nernst equation. The Nernst equation relates the measured voltage, E, to the reduction potential expected at standard conditions, E naught. R is the universal gas constant, T is the temperature, F is Faraday's constant, n is the number of electrons transferred in the half-reaction, and Qh is the reaction quotient. The reaction quotient is equal to the concentration of the chemical species being oxidized divided by the concentration of the species being reduced. For our galvanic cell, copper sulfate is reduced and zinc sulfate is oxidized. Since we know the concentration of copper sulfate, 0.05 M, we can calculate the concentration of the oxidation cell, which was zinc sulfate in our experiment.

Table 2. Zinc-copper Galvanic Cell
Zn-Cu Cell
Reduction Half-Reaction
Standard Reduction Potential (Eº), V
Anode (Oxidation)
Zno) → Zn2* (a9) + 2e-
- 0.72
Cathode (Reduction) Cu²*a9) + 2e → Cuo)
+ 0.34
Overall Cell Reaction_| Znø) + Cu²*(ag) → Zn²+* (a9) + Cuw)
Zno | Zn2" (a) || Cu²*» ] Cum)
E°cell = E°red (cathode) – E°red (anode)
E°cell = 0.34 V -(-0.72 V)
E°cell = 1.06 V
Cell Notation
Calculate the concentration of zinc sulfate solution using
Nernst equation.

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