Solve the following problems. 1. A voltaic cell is based on a Co²+ /Co half-cell and AgCI/Ag half-cell. a. What reaction occurs at the anode? b. What is the standard cell potential? 2. Using the standard reduction potentials, calculate the standard emf for each of the following reactions: a. 2A13+ + 3Cd 2Al+ 3Cd²+ b. Cr+ 2Cr³+ 3Cr²+ C. H2 + 12 2H+ + 21-

Solve the following problems. 1. A voltaic cell is based on a Co²+ /Co half-cell and AgCI/Ag half-cell. a. What reaction occurs at the anode? b. What is the standard cell potential? 2. Using the standard reduction potentials, calculate the standard emf for each of the following reactions: a. 2A13+ + 3Cd 2Al+ 3Cd²+ b. Cr+ 2Cr³+ 3Cr²+ C. H2 + 12 2H+ + 21-

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter18: Electrochemistry

Section: Chapter Questions

Problem 54E: The equation G = nF also can be applied to half-reactions. Use standard reduction potentials to...

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Consider the following standard reduction potentials: Tl+(aq)+eTl(s)Ered=0.34VTl3+(aq)+3eTl(s)Ered=0.74VTl3+(aq)+2eTl+(aq)Ered=1.28V and the following abbreviated cell notations: (1) Tl|Tl+Tl3+,Tl+|Pt (2) Tl|Tl3+Tl3+,Tl+|Pt (3) Tl|Tl+Tl3+|Tl (a) Write the overall equation for each cell. (b) Calculate E° for each cell. (c) Calculate G° for each overall equation. (d) Comment on whether G° and/or E° are state properties. (Hint: A state property is path-independent.)
Consider a galvanic cell based on the following half-reactions: a. What is the expected cell potential with all components in their standard states? b. What is the oxidizing agent in the overall cell reaction? c. What substances make up the anode compartment? d. In the standard cell, in which direction do the electrons flow? e. How many electrons are transferred per unit of cell reaction? f. If this cell is set up at 25C with [Fe2+] = 2.00 104 M and [La3+] = 3.00 103 M, what is the expected cell potential?
A metallurgist wants to gold-plate an object with a surface area of 17.21 in2. The gold plating must be 0.00200 in. thick (assume uniform thickness). (a) How many grams of gold (d=10.5g/cm3) are required? (b) How many minutes will it take to plate the object from a solution of AuCN using a current of 7.00 A? Assume 100% efficiency.
The equation G = nF also can be applied to half-reactions. Use standard reduction potentials to estimate Gf for Fe2+ (aq) and Fe3+ (aq). Gf for e= 0.)
A galvanic cell is based on the following half-reactions: In this cell, the copper compartment contains a copper electrode and [Cu2+] = 1.00 M, and the vanadium compartment contains a vanadium electrode and V2+ at an unknown concentration. The compartment containing the vanadium (1.00 L of solution) was titrated with 0.0800 M H2EDTA2, resulting in the reaction H2EDTA2(aq)+V2+(aq)VEDTA2(aq)+2H+(aq)K=? The potential of the cell was monitored to determine the stoichiometric point for the process, which occurred at a volume of 500.0 mL H2EDTA2 solution added. At the stoichiometric point, was observed to be 1 .98 V. The solution was buffered at a pH of 10.00. a. Calculate before the titration was carried out. b. Calculate the value of the equilibrium constant, K, for the titration reaction. c. Calculate at the halfway point in the titration.
The standard potential for the reduction of AgSCN is 0.0895 V. AgSCN(s)+eAg(s)+SCN(aq) Find another electrode potential to use together with the above value and calculate Kspfor AgSCN.
Consider the following metals: Ag, Au, Mg, Ni, and Zn. Which of these metals could be used as a sacri?cial anode in the cathodic protection of an underground steel storage tank? Steel is mostly iron, 50 use -0.447 V as the standard reduction potential for steel.
Consider a battery made from one half-cell that consists of a capper electrode in 1 M CuSO4 solution and another half—cell that consists of a lead electrode in 1 M Pb(NO3)2 solution. (a) What are the reactions at the anode, cathode, and the overall reaction? (b) What is the standard cell potential for the battery? (c) Most devices designed to use dry-cell batteries can operate between 1.0 and 1.5 V. Could this tell he used to make a battery that could replace a dry-cell battery? Why or why not. (d) Suppose sulfuric acid is added to the half—cell with the lead electrode and some PbSO4(s) forms. Would the cell potential increase, decrease, or remain the same?
Using values from the table of standard reduction potentials, calculate the cell potentials of the following cells. (a) Ga(s)|Ga3+(aq)Ag+(aq)|Ag(s) (b) Zn(s)|Zn2+(aq)Cr3+(aq)|Cr(s) (c) Fe(s),FeS(s)|S2-(aq)Sn2+(aq)|Sn(s)
You have a concentration cell with Cu electrodes and [Cu2+] = 1.00 M (right side) and 1.0 104M (left side). a. Calculate the potential for this cell at 25C. b. The Cu2+ ion reacts with NH3 to form Cu(NH3)2+ by the following equation: Cu2+(aq)+4NH3(aq)Cu(NH3)42+(aq)K=1.01013 Calculate the new cell potential after enough NH3 is added to the left cell compartment such that at equilibrium [NH3] = 2.0 M.
An electrochemical cell is set up using the following unbalanced reaction: Ma+(aq)+N(s)N2+(aq)+M(s) The standard reduction potentials are: The cell contains 0.10 M N2+ and produces a voltage of 0.180 V. If the concentration of Ma+ is such that the value of the reaction quotient Q is 9.32 103, calculate [Ma+]. Calculate wmax for this electrochemical cell.
Consider a galvanic cell based on the following half-reactions: a. What is the standard potential for this cell? b. A nonstandard cell is set up at 25C with [Mg2+] = 1.00 105 M. The cell potential is observed to be 4.01 V. Calculate [Au3+] in this cell.