Copper-Zinc Voltaic Cell
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- เผยแพร่เมื่อ 6 ก.ค. 2024
- Introductory chemistry demonstrations in the laboratory | A copper-zinc voltaic (galvanic) cell is demonstrated and explained | www.learnscience.co.za
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Components
0:59 - Need for an ion bridge
1:48 - Oxidation of Zinc & Reduction of Copper ions explained submicroscopically
4:24 - Macroscopic changes: mass and concentration changes
5:41 - Build up and movement of charge
6:20 - Movement of electrons
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Interesting experiment! Beautiful explanation.
The teacher is also a great storyteller... at somepoint I had the impression I was hearing a drama about the poor copper being abused by the evil zinc.
Alas! and I was rooting for the copper...
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for a moment there i thought i was at hogwarts lol but great job at explaining
LMAO was literally coming down to the comments to say the same thing🤣😂
(and I've never ever seen it before)
Not a chance. They're teaching science. That would never happen at Hogwarts.
#me too😀
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hi
One of the best explanations of a voltaic cell that I have heard so far. Also, your voice and accent are totally awesome! :-)
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May I know where you obtained those solutions and rods? I'm doing something similar for my science fair project, but can't seem to find a (reliable) source to find them.
YOUR VOICE OMGGGGGG!!! But GREAT explanation!! lol it did feel like hogwarts ;D
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how did you make the ionic bridge ?
may i ask what ionic solution is in the salt bridge and what is the volume?
Excellent experiment based theory show
lot of thanks for this awesome upload! it helped me so much
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Is it possible to add a plastic ball valve to control it on and off?
The lecture is excellent, thank you a lot!
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Extremely well explained!!!
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Thank you very much. Fantastic explanation! :D
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Why was the voltage decreasing?
that was amazing!!!
great explanation!!
Thank you!
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Thank you! Your explanation is great
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It feels like Hogwarts, she sounds a bit like Professor McGonagall. She explained just as clearly.
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great explanation ~!!!
What is there making the ionic bridge
Would it work with a smaller amount of each solution (how do you calculate how much you need)? If I wanted to make a series circuit, would I connect the beakers with more wires or more salt bridges, please? Thank you for the video!
The amount of solution will affect how long the battery lasts before getting flat, but not, within reasonable limits, whether it works or not or the emf of the cell. The concentrations of the solutions will affect the emf. Standard concentrations would yield the emf given on the table of standard reduction potentials (see other videos in this Playlist about this). You can place cells like this in series with one another by replicating cells like this and then connecting these replicas to one another by wires. Eg you could have two of these and then add a crocodile clip from the cu electrode of one to the zn of the other, and then measure the voltage across the 2 cells together.... Which should be double one on its own
Thank you so much! This is very helpful for my chemistry project :)
Thank you for the explanation--very well explained ^_^
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coppahh
Yes great video! Have you ever tried the "cylinders of the pharaoh"? They are ancient Egyptian electrical technology made from copper and zinc cylinders filled with quartz crystal when held produce up to 1.5 volts and can be purchased on Amazon for only 29.99
Thanks
Oh!!!! Voice is beautiful & Explained well!
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Why do the positive charges move from the zinc solution to the copper solution through the ion bridge? I thought zinc liked to be in it's Zn2+ ionic state? Is there too much build up of positive charge in the zinc solution? Also, why would that positive charge move to another equally positive solution in the Cu2+?
Like charges repel and unlike attract. There is a build-up of positive ions (Zn2+ cations) on the Zinc half of the cell due to the oxidation of Zn to Zn2+, and there is a depletion of positive ions on the Copper half of the cell due to reduction of Cu2+ ions to Cu. So the Copper side is not equally positive to the zinc side. Note also that by moving through the ion bridge, the Zn2+ ions don't change from their stable ionic state.
Can we take these copper plate from any battery
Why do we need the zinc ions to be in the solution in first place? The oxidation comes from Zn(0), what’s the point of already having Zn2+?
Good question. Indeed you don't. Actually you also don't need to have the cell divided into two. You could simply put both the Cu and Zn rods in the copper sulfate solution
Best Chemistry teacher ever !
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@@LearnScienceCoZa Well now I have! Thank you for the really helpful content. 😁
@@Cmdr_Sam :) Thanks!
how about so4(2-) ion, doesn't it go through the ion bridge?
Krishna Koirala nope
Yes, the SO4(2-) ions would also flow through the ion bridge, from the copper side to the zinc side
This is awesome.
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the best explination . thanks so much.
Thanks and pleasure
What molarity of the solutions do you use?
Sorry, I can't remember
Excellent!
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how much mass (ZnSO4 and CuSO4) is used in the solution? Thank you
Sorry I can't remember
It would be great if the closed captions were more accurate. This video is not accessible at this time.
How were zinc and copper solutions made?
Zinc sulfate dissolved in water and copper sulfate dissolved in water
Yo bro can u give me the summery of this experiment please
Hello, can we improvise this experiment? I couldn't arrange zinc sulphate chemical as I couldn't find it anywhere. I live in a very small area. Can we do this with some other method? Or can I use something else instead of zinc suplhate?
Yes you can indeed! The easiest way to improvise a voltaic (galvanic) cell is by sticking two different metals into a fruit or vegetable (e.g. a lemon). If you have a voltmeter, you can measure the potential difference generated by the redox reactions at each of your electrodes (metal rods). If you don't have a voltmeter, but you have an LED, then you will need to connect a few of your fruit-cells in series with one another to get a potential difference that is high enough to make your LED shine. Hope you come right! Have fun!
@@LearnScienceCoZa hey thank you so much. Can I also use iron sulphate instead of zinc sulphate and dip filter paper in sodium chloride solution and use it a salt bridge? Or in potassium nitrate solution
Can anyone tell what is hogswart?
may i ask what is the volume of the copper ion solution and zinc ion solution
Those are 250 ml beakers
Does saturating the solutions increase the cell potential voltage?
yeah
Depending on which solution you saturate. If you add in more of the copper ions then it would be supporting the forward reaction and therefore you'll have an increase in voltage. But if you add in more of the zinc ions then you will be supporting the backward reaction and voltage will therefore decrease.
anyone still lurking in these comments, just look up the nernst equation and itll give you a proper answer/explanation
I love your voice. Thank you.
Thanks for listening
You are amazing!
thx
very helpfull because it fact , thank sir
i am not sir i am woman no problem thank you subscribe
Good explanation
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Just notice that after the An ,and Ca is connected time by time the Levels of the Two Solutions change ....CuSO4 goes down and ZnSO4 goes up :D just pause and see clicking time to time :D
u talk so sweetly
What amount of zinc solution is required when we don't know the concentration of copper sulphate solution?? And what is the range of voltage for this reaction? Please someone help me.I am recovering copper from e-waste
Sorry, I really don't know. Hopefully someone else can answer...???
Why the solution in the ion bridge turns blue? I thought only the anions in the copper half cell will flow to the ion bridge???
There would be diffusion of the blue copper sulfate solution from the beaker in which there is a higher concentration of copper sulfate, through the ion bridge, to where there is a lower concentration (and the same for the transparent solution in the reverse direction) whether or not a redox reaction occurred. Since a redox reaction is occurring, there will additionally be movement of both cations and anions through the ion bridge, in reverse directions, to complete the circuit.
thx... mam... video is helpful
Most welcome 😊
What is the cost of salt bridge?
In the video its just a tube filed with the solution
pretty cool. thanks. :D
Glad you like it!
Very nice video
Thank you!
thanks
np
OMG that zink copper story about stability hahahhahahah man i'm rolling on the ground
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If voltmeter's resistance is supposed to be near infinity, why can the reaction still happen if the electrons can't pass through the voltmeter?
Great video with clear explanations btw!!
Good question! I guess it's because the voltmeter's resistance is not infinity after all? - it's theoretically infinite, but in practice it isn't, so there is a low current that does flow through the voltmeter.
@@LearnScienceCoZa Thanks! So in theory, the rate of reaction should be much higher if the voltmeter wasn't present at all, right? Haha xD
Yes. I think that's why you can't see any corrosion of the zinc and deposition of the copper when I raise them up to show... Reaction rate is too slow.
@@LearnScienceCoZa Yup, but we still got to see the Voltmeter Reading drop over time though xD
Lucky you! 😂
thank,s
You are awesome
Appreciated
Your English is very sweet
i try
Is that ~1000 Volts? or ~1.000 Volts?
Definitely not 1000 Volts!
i just love u
ye
2:49
Show the ampere
The question is , how long this thing lasts before the plates corrode...
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@@LEO-xo9cz yeah I liked it thanks ;)
holy shit her accent is so mesmerizing. im stunned
use uh silence to avoid stuns
i thought my conscience was talking to me lol
Damn her voice is so nice
anyone else tried the subtitles and found them funny?
Hahahah
Why not just use a copper wire instead of using a salt bridge.?
Because ions, not electrons, are needed to complete the circuit between the two solutions, and ions need a salt bridge, not a copper wire, to travel through.
Its called a galvanic cell, but a voltaic cell is well named
+public cydia tweaks Actually both galvanic cell and voltaic cell is correct.
+GamePhysics oh ok
her voice op
lol...thanks
Email address
My teacher is an idiot, I asked her why do we need copper sulphate solution as a electrolyte when we already have a load of copper for electroplating she was like," In case the copper in the copper sulphate runs out we need the help of the load of copper"
Now say, who agrees?
Like this, if you dont!
Look at you, doctor SMARTY PANTS!
Her accent is hot!
Brookie definitely, British accents are awesome...
Tru tru
Nice video, but I'd suggest to avoid anthropomorphizing atoms and solutions. It is actually distracting and simply wrong, atoms don't want anything, if you so need to convey that they'd "tend to". As teachers it is important to use propper language when teaching. The macroscopical tendences are just statical phennomena arising from problable energy states of single atoms and should not be treated as "willing".
Zinc and copper wanting to be ions??? Hahaha! Ever heard of electronegativity, lady?
Can someone help me out 😏 how will positive ions move through the ion bridge 🌉