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Solved: A steady current was passed through molten CoSO4

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 18.55 Chapter 18

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 18.55

A steady current was passed through molten CoSO4 until 2.35 g of metallic cobalt was produced. Calculate the number of coulombs of electricity used.

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Note Set #8 – week 10 Analytical Chemistry VOLTAMMETRY  Cyclic Voltammetry – a variable voltage is applied to a chemical cell system over a period of time, increasing from 0 to about 800 mV, then back to 0 o Depending on how quickly the electrochemical reaction is able to occur, the rate at which one “scans” the voltage up and down differs; if the rxn is slow, the voltage scan must be slower o The effects of a cyclic voltammagram are graphed with a duck curve  the duck curve maps the voltage applied vs. the resultant current in the system  Analyzing the duck curve of a voltammagram o The min and max peaks of the curve show the greatest current, which denotes the point at which an oxidation or reduction is occurring at the greatest rate. o NOTE – the peaks will then taper out to a limiting amperage, and the curve approaches this level asymptotically. This current is called the diffusion limited current; diffusion limits how fast molecules can approach the surface of the working electrode in the system to be either red’d or oxi’d  The voltage halfway between the two peaks of the curve marks the reduction potential of the species being analyzed in the cell system  Over potential o Over potential: is the kinetic barrier that must be overcome using enough voltage to make an electrochemical rxn occur. Denoted Greek letter eta (η)

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Chapter 18, Problem 18.55 is Solved
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Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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Solved: A steady current was passed through molten CoSO4