WCLN - Electrolytic Cells Type 3 - Introduction

In Type 1 and Type 2 electrolytic cells, the electrodes are inert, or unreactive. In a Type 3 electrolytic cell, the electrodes are composed of metals which could react. This video introduces a type 3 electrolytic cell equipped with a copper anode, an iron cathode, and an electrolyte of aqueous copper(II) sulphate. You are shown how to use the standard reduction table to determine the half-reactions at the anode and the cathode. In addition, the processes occurring in this cell are explained in detail.
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0:02remember in type 1 and type 2 electrolytic cells
0:05the electrodes brawlers inner take three electrolytic cells
0:09involve electrolysis Bay quieres our water solutions
0:13using electrodes that can be reactive meadow we'll start with the power supply
0:18wires in a container
0:20and will attach a copper strip to the positive terminal
0:24which becomes a copper and no I will attach an iron strip to the negative
0:29terminal are the parts supply
0:30which becomes and iron cather
0:34when this which is close to power supply takes electrons from the copper anode
0:38and prompts them onto the iron cap toe
0:42so the anode becomes positive in the capital becomes negative
0:47was simple by the electron symbols on the electrodes
0:51and will add a one molar copper to sulfate solution to the container
0:56the copper and the South Bay diane's I'm moving randomly in this solution
1:01but this solution is a quiz so we can also show some the water molecules
1:05present
1:08now will focus on the iron cap toe
1:11remember reduction takes place at the Capitol
1:16the water may be reduced or copper tube by signs may be reduced
1:22in this tape three cell the capital it is not a nerd
1:26we have an iron captor
1:29so the question we ask ourselves is nein capital itself
1:33be reduced
1:36the answer is no
1:39does in metallic Parmar composed at neutral metal atoms
1:44metal atoms will not gain electrons to become negative Matt alliance
1:49negative met Alliance cannot be formed
1:52metal Adams tend to lose electrons night game
1:57the metal electrodes are never reduced
2:01and we can say that the cathode Matteo is never reduced
2:06also remember that reduction is all that occurs at the cathode
2:11oxidation never occurs at ICAP though
2:15so we can say that the cathode meadow is never oxidized
2:19because the cathode Matteo is neither reduced are oxidized
2:24we can say that the cathode meadow never reacts
2:27in an electoral XL
2:31so even though our cap though it is iron metal the only possible species that can
2:35be reduced
2:36our water for copper to plus science
2:41season this diagram we'll ask whether copper to class
2:44for water is reduced at the Capitol
2:48remember at the cathode any cat eye and about this over potential arrow
2:53will be reduced from a quick solution even if water is present
2:58and many Catalans below this over potential a row will not be reduced from
3:02a clear solution
3:04we see that copper teapot signs are higher than your for potential arrow
3:08for the reduction of water
3:10the copper to put signs will be reduced at the Capitol
3:16which we can show here by putting a check mark by the copper to pious
3:20and an axe by the water
3:23so the HAP reaction occurring at the cathode SL
3:26is c2 plus bus two electrons
3:29gets copper solid
3:31now will focus on the an O
3:34remember oxidation occurs at the anode
3:38because the anode is positive it will not attract positive copper ions
3:43so one candidate for oxidation is water
3:47another candidate is the sulfate I N
3:50at the anode itself is not a nerd
3:53it is the metal copper
3:57the question we must ask is can the copper anode itself be oxidized
4:03the answer is yes metal atoms can be oxidized
4:07and lose electrons to become cat I S
4:10so we have three candidates for oxidation at the anode
4:13water the sulfate I N
4:17and the copper anode itself
4:20going back to this diagram will represent the anode within a pious
4:25and the possible candidates for oxidation at the anode
4:28our water
4:30the sulfate I N
4:32and the copper metal anode its up
4:36but we don't know which one of these three species well actually be oxidized
4:41looking at the reducing agents on the right side at the reduction table
4:45remember that oxidation potentials increase
4:49as we move down this time
4:52it's the same thing is saying that reducing agents get stronger
4:55as we move down the right side
4:59remember oxidation potentials up the reducing agent shown here