10. Consider the battery below containing 1M CuSO4 and 1MZnSO4 which is capable delivering a voltage of 1.104 V. You need this voltage to operate your device. Eventually the battery will stop functioning as the voltage will drops to near zero. What can you do to extend the lifetime of the battery. Copper (cathode) 1 Cule 2 Na Voltmeter 0.76 V Sat bodge Cu²+2 Cu(s) +0.34 V Cu Zn(a) $0,2 Zn²+ 2n a. Modify your device to operate at a lower voltage. b. Increase the concentration of CuSO4 in the electrolyte. c. Increase the size of the Zn anode. Zine (anode) Zn(s) 2²2 +0.76 V Zn²+ Cu(a)

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter25: Voltammetry
Section: Chapter Questions
Problem 25.11QAP
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9. Consider the reduction of 10-3 mole/cm³ Cu²+ to Cut which has a diffusion limited current
density of -9.2 mA/cm², for a diffusion boundary layer thickness of 10-² cm and an
electrolyte diffusivity, D, of Cu²+ of 1 x 10-6 cm²/s. Determine the diffusion overvoltage at a
current density of -4.6 mA/cm².
a. -1.78 V b. -0.178 V c. -0.0178 V d. -0.0018 V
10. Consider the battery below containing 1M CuSO4 and 1MZnSO4 which is capable delivering
a voltage of 1.104 V. You need this voltage to operate your device. Eventually the battery
will stop functioning as the voltage will drops to near zero. What can you do to extend the
lifetime of the battery.
Copper
(cathode)
1
Voltmeter + 1.10 V
Salt bridge
Cu²+2 Cu(s) +0.34 V
Cu²+ Zn(s)
Zine
(anode)
Zn(s) Zn²+20 +0.76 V
Zn²+ + Cu(s)
a. Modify your device to operate at a lower voltage.
b. Increase the concentration of CuSO4 in the electrolyte.
c. Increase the size of the Zn anode.
Transcribed Image Text:9. Consider the reduction of 10-3 mole/cm³ Cu²+ to Cut which has a diffusion limited current density of -9.2 mA/cm², for a diffusion boundary layer thickness of 10-² cm and an electrolyte diffusivity, D, of Cu²+ of 1 x 10-6 cm²/s. Determine the diffusion overvoltage at a current density of -4.6 mA/cm². a. -1.78 V b. -0.178 V c. -0.0178 V d. -0.0018 V 10. Consider the battery below containing 1M CuSO4 and 1MZnSO4 which is capable delivering a voltage of 1.104 V. You need this voltage to operate your device. Eventually the battery will stop functioning as the voltage will drops to near zero. What can you do to extend the lifetime of the battery. Copper (cathode) 1 Voltmeter + 1.10 V Salt bridge Cu²+2 Cu(s) +0.34 V Cu²+ Zn(s) Zine (anode) Zn(s) Zn²+20 +0.76 V Zn²+ + Cu(s) a. Modify your device to operate at a lower voltage. b. Increase the concentration of CuSO4 in the electrolyte. c. Increase the size of the Zn anode.
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