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Electrolysis of Water
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- เผยแพร่เมื่อ 20 พ.ย. 2015
- Experiment with data for electrolysis of water. A 9V battery is used to decompose water in a 3M NaOH solution. The data shows a smaller volume of gas produced from one electrode (3.8 mL) and a larger volume of gas produced from the other (7.6 mL). These gases are tested using a splint to confirm hydrogen is the larger volume of gas and oxygen is the smaller.
Alternatives to sodium hydroxide are safer for contact, but most produce gases either through electrolysis or as acid is produced.
I tried using sodium bicarbonate, sodium acetate, sodium citrate, potassium nitrate and sodium sulfate using various concentrations in distilled water. Only 3M NaOH avoided this problem.
watching ur vid is a part of my online school work now
me too XD
In malaysia too
yeah same chemistry is just sad now
in Mexico too
Me to
No cap but I'm pretty sure 150k of the views are teachers and students watching this for online classes. No wonder educative video publishers became so famous in the COVID-19 age.
I am a student watching this for my online class right now!
@@victor_istaken Same man ! Even im watching this video during online class . Btw , which class r u from ?
Thank you so much it helped me a lot during online classes (COVID-19)
Thank you for posting this. I always have difficulty carrying out this demonstration in class.
I have never seen such a outstanding experiment on water electrolysis ever. Thanks alot
This I felt as my school laboratory....I liked this very much
I tried this in a small bottle with 2 stainless steel plates about 0.3mm apart and drew about 20A at 5V. Distilled water with some NaOH in it. The production of H2 and O were abundant.
The stainless steel electrodes never corroded and still looked like new.
The explosive power of the mixed gasses is amazing! (In small quantities of course). A small amount lit makes a loud bang.
This could be better explained.
First, the polarities should've been established. Who is the cathode (-) who is the anode(+).
Then, describe the chemistry behind the reaction.
H2O produces twice more hydrogen molecules than Oxygen, as H2 and O. Then calculate the molar volume of Hydrogen and Oxygen and confirm with empirical results.
As ideal gases volumes are known as 22.4 L/mol and hydrogen has twice as much than oxygen.
I wish you didn't block the ignition of the oxygen and hydrogen with your hand.
Why?
This video is demonstrating something really interesting.
But if you filmed it again there would be many improvements you could make!
When you’re performing the splint test on the hydrogen, it would be a great idea not to put your hand in-front of the camera.
Equally, it would perhaps be better if both test tubes were full of their respective gases the second time around to give a more dramatic example of the reaction that takes place when they are ignited!
It is nice that you have demonstrated this reaction.
you saved me understanding concept
Lol, I got assigned this for school😭 one of the questions is ‘Include an explanation as to why the water was able to be broken apart.’ Which I don't understand-
Video is very good ,i was searching for this .....its work in my online school .....
Thanks bhai video banane ke liye
Hi Scott, i am conducting a research, in which i choose 3 compounds as electrolyte/catalyst:
1.) Sodium Hydroxide
2.) Potassium Hydroxide
3.) Potassium Carbonate
Can you please suggest me which one will be good if i will use the same source of energy to compare.
i want to generate the setup that will be efficient or can generate large amount of H2 gas.
as i am making an experimental data, you can additionally share the records of the experiment conducted by you as you described in the description.
Also i want to know what are the factors that relates the performance of this kind of setup or cell, and how we can control the efficiency of this cell.
i want to make the most efficient HHO generator, that means the one which use less power and produce more HHO
I tried a lot of different compounds, 3M NaOH was far superior for getting the correct 2:1 ratio of gases. Anything with chloride would make limited amounts of chlorine which would dissolve in the water. Sodium sulfate would produce sulfur oxide gases, sodium bicarbonate did not work well. The biggest problem is the production of other gases, but even NaOH would produce odd results if not at the correct concentration.
Very nice
So how using electrolysis do we keep four people breathing in a space station, for 438 days? I don't understand at all.
No idea if you are still watching this space, Scott but ... is any NaOH lost in the process? i.e. if you arranged to keep the volume of water constant as the hydrolysis occurred, would the NaOH solution remain at 3M? Or would a constant resupply of NaOH be required to maintain the concentration? Thanks for the video :)
A bit spills out due to the bubbling. Not much, I don't think any net is loss due to reaction because H+ and OH- are both generated and the solution mixes regularly when the test tubes are moved. Everything I've experienced is that it remains 3M, it does discolor often due to the burning splint residue so I only reuse solutions for 5-6 runs of the experiment usually.
@@APphyzicks ... Thanks a bunch!
what about the pop sound in oxygen (when flame kept near) and there isnt any blue flames seen while reaction with hydrogen.
Why is it.
Wow cool 👍👍 and amazing 👍👍👌👌
Why do we add a small amount of dilute acid to the water before electrolysing it?
The dilute acid in water creates ions which will allow the electricity to flow into the water as well. This will electrically decompose the water to give us the two gases namely oxygen and hydrogen. Hope this helps
Do we need to change the electrode after several uses? How much electrolyzed water would we got per gram electrode?
Tnx very much i really helped me to understand 😊
Thanks! Helped a lot...
With what?
@@seancerillo3056 studying- duh
Is the glowing splinter test not for oxygen?
I like the apparatus you used. Do you know where we could find one?
Came for the ignition. Should have checked the comments first.
thank you very much sir. please do others experiments
What the main goal of this investigation
Why the gas collected in testtubes differ
direction of electrical flow
oxygen collects on inflow side
hydrogen collects on outflow side
Are the hydrogen and oxygen gas formed neutral charge?
So they can't attract or repel other ions? Or make new molecules?
I saw a video from plasmacluster air purifier saying it made O2- and H+ ions that attach to coronavirus spike proteins and form negatively charged OH radicals that electrostatically attract H+ from the surface protein of the virus and break it down.
But if the gases made from water electrolysis are neutral charged then I don't understand how that is possible.
Hi sir, if you continue to run this experiment, does all the water will be completely drained and become only Hydrogen Gas & Oxygen gas?
The electrode loses contact with the solution in the H2 side eventually and the circuit shuts down after about 12 mL of H2 gas are produced, if you could keep the solution in contact it would keep going for a while but the top isn't covered in a way to push the solution out.
Scott Milam you mean that the solution in the end will run out of "Baking Soda" and hence the H2 Side will lose contact with the solution?
Scott Milam How about if i continuously channel out the H2 & O2 gas out from the Test Tubes to another container (example attemp: th-cam.com/video/gZJEDe_HUcw/w-d-xo.html), does it mean this electrolysis can be continue for infinate time ? Or I need to constantly add NaOH into water in order to keep the electrolysis running infinate time?
It'd be hard to do that effectively in my opinion. Or at least if that's your goal it'd be easier just to decompose peroxide and hook up tubing so you could still do a collection over water. Then for H2 just add Ca to water or a reactive metal to acid. You wouldn't be able to keep a seal with the electrolysis kit and it would take longer than the alternatives.
2:9 need to focus on tubes
Why would you need to have a sodium hydroxide solution added if you are trying to demonstrate the production of gas from water? Will it work without it? How do you know the nodes are not simply reacting with the solution to create the gas? I see liquid has reduced in the tank very minimally, and this demonstration is very unsatisfactory. We should be able to measure the gases and see how they relate to the water, but more importantly understand the reaction of the use of sodium or potassium hydroxide and its reaction on the electrodes, and isolate this from what we assume as gas production from water.
Excellent experiment, clear and simple
wow
great
Why do your hand keep obstructing whenever you burn the hydrogen test tube?
How did both the gases got collected in two different test tubes?
Hi. I've been searching high and low but can't find an answer. How do you confirm the source of H and O. A hydroxide is rich in H and O, why is this not considered?
This experiment is very useful for me...But,how can we prove these gases separately???plz reply me.
Is this a set-up you can buy or did you make this?
Slightly misleading that during the video you switch to another battery (to provide higher current) without saying so. 12V?
I have a question- can water and salt disenfect once process in electrolysis
Nice abouse
Thank you so much for this video this is so important activity for me
Dear Sir.
Warm Regards,
I'm Aashish.
I'm a teacher by profession and run a TH-cam channel.
I wish to use this video (electrolysis of water) to play on my TH-cam channel.
I teach a few kids who are not economically well off. But they are eager to learn things.
I hope you'll allow me to use this video.
??
0:41 to what did u attach the wires on the setup? We're they tumb pins ?
They were graphite from pencil.
hey scott,i am wondering what could be the hypothesis and the objective ?
please answer
haitham ali do your own science homework
Due to the polarising effect of the electric current the oxygen and hydrogen becomes polarised and are arranged in two different rows as seen in video. Oxygen carries the negative charge hence it is attractted towards the anode and hydrogen carries positive and hence attracted towards the cathode. Hence oxygen and hydrogen get seperated in anode and cathode respectively. But as you can see in the cathode test tube the amount of empty space is double than anode tube because hydrogen reacts in ratio 1:8 by mass this means water is in the form 2 hydrogen atoms and 1 atom of oxygen.
@@rumaprakash3894 LOL, responding 4 years later is really gonna make an impact
@@ezzyyyyyyyyyyyyyyy Dont you know about butterfly effect, everything has an impact!
A bit of NaOH is far better than using sodium bicarbonate or sodium carbonate.
Why did my water turn green
Misleading title of this video. It is not the electrolysis of water. It is the electrolysis of lye water.
Really helpful thank uuu.....
This Helped me a lot!!! 😇
So if one wanted to collect both gases, why would 3M NaOH be safer than plain distilled H2O? If NaOH is safer, then would keeping some of the salt in the water during distillation be prudent?
H2O in a pure form would not carry out electrolysis because in its pure form it does not conduct electricity. An ion producing substance like NaOH or H2SO4 is necessary to donate ionization without harming the purity of H2 and O2 gas.
So what about salts? Water straight out of the tap has plenty of that. So does water out of the ocean.
I want to know which material you used for the electrode~~~
Graphite
Pencil
How do I use this to oxygen water
What are the materials used
Very interesting and helpful video
So helpful thank u
We need to separate hydrogen from oxygen in the air
Heatwaves are partially from vapour build up in the air
Thank's for this v d o 😍😍😘😘
Wow
Thank you
Wish you did not cover than happened with the fire and gas at 2:55.
You blocked the explosions
hey thomas u watchin' this?? HAHA
rotoshaw
rotoshaw
What materials were the electrodes made of?
I'm not sure, they don't look like graphite, maybe Arbor Scientific that sells them would say.
Jeremy Morales platinum foils
the negative electrode can be made of less reactive metal like Copper and the +ive electrode must be graphite.....the positive electrode will release O2 therefor if you use a metal, oxide of that metal will form. in the negative electrode H2 gets produced therefore you don't need to worry about that. just remember that you need a graphite rod at the positive electrode. you can get this rod by throwing an empty AA sized 1.5V dry cell on your wall ... open the contents safely after you see that the metal cover is wide enough... carefully take out the carbon rod.... and wash it with water to remove the reactive stuff.... and then you can use em...... careful while handling H2.... its the best fuel.
Hey sir...
I have a theory about electrolysis of water.. I want to discuss it in personal ..
Can you tell me any place where I can ask if that is possible?
Let's discuss here
@@maryamira417 it's not personal sister 😁
hey scott - try using magnesium ribbon as both electrodes - you will be very interested in the results!!
Thnx
Which one is oxygen and hydrogen
in h2o what is more ,, oxygen or hydrogen,, ,,, once u find that out have figured out which is which
I’m watching this for only school but I just noticed this dude sounds so similar to 5up xD
I KNOW RIGHT?? lmaoo
Hey scott, just wondering, why does the water need to be in a 3M NaOH solution? Thanks
It needs something ionic to conduct electricity through the water, the 3M NaOH produces the least alternative gases that would otherwise mess up results. I am not sure why the concentration matters, but I tried about 8 other solutions and this was by far the best. Anything with chloride produces enough chlorine (that dissolves) to alter the 2:1 ratio.
Does the NaOH count as part of the equation, as a reactant? And what are some alternatives? Thanks!
not the net reaction (2H2O --> 2H2 + O2) but if you split it into 1/2 reactions it is involved, alternatives are anything that conduct electricity when aqueous but don't have an anion that produce an alternative gas. I tried NaC2H3O2, Na2SO4, NaHCO3, NaCl and sodium citrate and none worked as well, but would give a 1:1 or 3:1 ratio.
Ok I just realized the answer to my question... anyway, what substances should be used for the electrodes so that they don't corrode? Thanks
graphite works best, if you buy the kits I use in the video it's all set for you and you can just clip alligator clips to the battery.
The title is misleading, "electrolysis of water ? You used a solution, not water ?
@Yann cedric Totsingan once you've added an electrolyte, its then a solution, no?
@@bloodsthicker5651 without adding acid water cannot be electrolysed. Distilled water is a bad conductor of electricity.... so by adding acid, it becomes a good conductor of electricity..... Hope that helps you🙂🙂🙂🙂
@@biswajitdutta770 water is an insulator, so no, you can not pass current through it. The current will flow through the electrolyte in the water, there for, you are splitting the ELECTROLYTE!.
@@biswajitdutta770 water can not be made nor destroyed, you'll only ever change the state ie. Solid, liquid, gas (vapour). If you believe water to be two gasses in our pressure system, prove it. Find someone that's made a specific amount of water from two specific amounts of the two gasses. Best of luck to you 👍
@@bloodsthicker5651 thats why I am adding acid.....
what voltage was used and what concentration of acid?
9V and 3M NaOH
6
Electrolysis of sodium hydroxide solution should be your title no?
Should it?
Where did u get the apparatus
+kevon wen Arbor scientific sells them, they are wonderful www.arborsci.com/student-electrolysis-apparatus
Semoga outreach saya berjalan lancar ❤️❤️🤲🏿🤲🏿
who here watch this because of google classroom
totally not me
@@srymunipanha3059 who are u
why does the negative side has more bubbles?
Why H2 to O2 in 2 to 1 ratio ?
Because, in the formula of water is H2O, so hydrogen produced will always be double of oxygen.
@@rahnuma-e-hayat7921 thank you very much !
Me too professor
Guys at 2:56 what he used to test?
The 1 st tube is filled with hydrogen gas... When ke kept the burning matchstick into the hydrogen tube... Their is pop sound heard for us.... But in 2 nd tube.... Oxygen gas is filled.. So when he kept the burning match stick kept into the oxygen tube... It gets burning extra..
@@neelakandan687 after 7 months you are replying now i am in 9th and i got to know every single thing of electrolysis 🙄
9 th std...??. This topic... Is related in 10 th std... How is it possible in 9 th std itself.... However.. I have just informed the answers about your q.... That's all...
1:50 .. water clearly being at 3.5 (you can see the water exactly on the half-line)
Him: "Yea clearly 3.7, 3.8"
Wut..
Hello Markus F
Pls explain the introduction of the activity.
Smitha Arun Arun, water is H2O, the electricity splits it into H2 and O2, the hydrogen is double the oxygen because 1 H2O has H2 and O1
you can take your computer's CPU 5V ports to get this... but greater the V the faster it is.
anyone elses bum teacher making u watch this?
You will never know the truth about "electrolysis"...
Amazing and informative👍👍👍👍
From ups
Awesome i know man your my best friend dude
From india
علم مش خلطه وانفجارات
you make something interesting become uninteresting sir
That was kind of offensive. Plus, he makes it sound interesting, you're just not into science.
Technoblade voice
Not even close
Hii
campo anyone
Bhai pani waste mat kar
Lol