Answered: Predict what is liberated at each…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.16QAP

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For the cell: Cr|Cr3+Co2+|Co E° is 0.46 V. The same cell was prepared in the laboratory at standard conditions. The voltage obtained was 0.40 V. A possible explanation for the difference is (a) the surface area of the chromium electrode was smaller than the cobalt electrode. (b) the mass of the chromium electrode was larger than the mass of the cobalt electrode. (c) the concentration of Cr(NO3)2 solution used was less than 1.0 M. (d) the concentration of Cr(NO3)2 solution used was less than 1.0 M. (e) the volume of Cr(NO3)2 solution used was larger than the volume of Cr(NO3)2 solution used.
Use Table 17.1 to answer the following questions. Use LT (for is less than), GT (for is greater than), EQ (for is equal to), or MI (for more information required). (a) For the half reaction 12Br2(l)+eBr(aq)Ered1.077 v. (b) For the reaction 2Br(aq)+Co2+(aq)Br2(l)+Co(s)E0. (c) If the half reaction Co2+(aq)+2eCo(s) is designated as the new standard where Ered is 0.00, then Ered for 2H+(aq)+2eH2(g) is 0. (d) For the reaction 2Cr3+(aq)+3Co(s)2Cr(s)+3Co2+(aq) the number of electrons exchanged is6. (e) For the reaction described in (d), the number of coulombs that passes through the cell is9.648104 .
Consider a concentration cell that has both electrodes made of some metal M. Solution A in one compartment of the cell contains 1.0 M M2+. Solution B in the other cell compartment has a volume of 1.00 L. At the beginning of the experiment 0.0100 mole of M(NO3)2 and 0.0100 mole of Na2SO4 are dissolved in solution B (ignore volume changes), where the reaction M2+(aq)+SO42(aq)MSO4(s) occurs. For this reaction equilibrium is rapidly established, whereupon the cell potential is found to be 0.44 V at 25C. Assume that the process M2++2eM has a standard reduction potential of 0.31 V and that no other redox process occurs in the cell. Calculate the value of Ksp for MSO4(s) at 25C.
Based on the cell potential measured for the cells Co(s)|Co2+(aq) Cu 2+( aq)|Cu( s)E=0.614VFe(s)|Fe2+(aq) Cu 2+( aq)|Cu( s)E=0.777V what potential should you expect to find for the following cell? Fe(s)|Fe2+(aq)Co2+(aq)|Co(s)
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?
Consider the concentration cell in Fig. 17-10. If the Fe2+ concentration in the right compartment is changed from 0.1 M to 1 107 M Fe2+, predict the direction of electron flow, and designate the anode and cathode compartments.
For the ?G values given here, determine the standard cell potential for the cell.. (a) 12kJ/mol,n=3 (b) 45kJ/mol,n=1
Is the following statement true or false? Concentration cells work because standard reduction potentials are dependent on concentration. Explain.
In biological systems, acetate ion is converted to ethyl alcohol in a two-step process: CH3COO(aq)+3H+(aq)+2eCH3CHO(aq)+H2OE=0.581V CH3CHO(aq)+2H+(aq)+2eC2H5OH(aq)E=0.197V (E°' is the standard reduction voltage at 25°C and pH of 7.00.) (a) Calculate G°' for each step and for the overall conversion. (b) Calculate E°' for the overall conversion.
Consider the cell described below: Zn|Zn2+(1.00M)||Cu2+(l.00M)|Cu Calculate the cell potential after the reaction has operated long enough for the [Zn2+] to have changed by 0.20 mol/L. (Assume T=25C.)

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	Anode Product	Cathode Product
a. H₂SO₄
b. K₂SO₄
c. CuSO₄
d. AuCl₃
e. KCl

Predict what is liberated at each electrode when aqueous solution of the following are electrolyzed between inert electrodes.