Recreating the Briggs-Rauscher oscillating reaction

[@mikeobarr8589]

You know that you are doing something right when people like myself (no possible way to perform any of this) are 3 hours deep into your back catalog. Well done. Beautiful camera work and a high quality of production are icing on the cake.

[@OxyDoesIt]

Mike O'Barr a lot of people do it in AP chemistry

[@OxyDoesIt]

Mike O'Barr in highschool

[@ronaldbrown9638]

I did it in my personal lab freaked my sisters kids plum out 😂

[@lisettecallis5329]

@@ronaldbrown9638 lol

[@richardnlauraclaessens2408]

I agree well well presented you're very clear speaker just don't talk down to people

[@KakashiBallZ]

Whether Briggs and Rauscher actually sat down and conceived this or if it was a serendipitous discovery, this reaction is so damn bizarre and complex. I'm stunned they came across this.

[@NileRed]

I believe they actually sat down and tried. There was a lot of info on related reactions already though. They didn't just pull it from thin air

[@KakashiBallZ]

That's just....wow.

[@rishyanth-zh9bv]

@@KakashiBallZ Kakashi change your profile picture your eyes are fixed

[@sphrcl.]

@@KakashiBallZ kakashi is stupid

[@zlodevil426]

@@NileRedWe stand on the shoulders of giants

[@originalname28]

The ultimate “BUT WAIT THERE’S MORE!”

[@MrRishik123]

How about making a doomsday chemical series. Such as a few episodes to making antiseptics and maybe a few others to make antibiotics and so on. And maybe another few to make useful chemicals you think would be good in a doomsday situation.

[@elsasslotharingen7507]

This is a great idea

[@DoctaOsiris]

I would really like to see that too 😊

[@henryjiang9664]

Mr Rishi The Cookie You predicted North Korea.

[@originalname28]

YES

[@matthewmaca6675]

Strike in 3 2 1

[@DanielSMatthews]

Best demo of the Briggs-Rauscher I have ever seen, with bonus clean up procedures too. I'd buy one of your beakers except they probably don't work in Australia because the hole is on the wrong end for use in the southern hemisphere. ;-)

[@lil_weasel219]

thats a myth I believe xD. The thing about the vortex direction

[@vecronatt]

It's the fox! but australia is upside down. he needs the hole on our bottom.... that sounded horrible... ima go n rethink my life choices.

[@Merennulli]

There's definitely a market for Australian beakers. I'd like one for keeping helium in. It keeps getting out of my American beakers.

[@Merennulli]

@chu Harry Are you trying to get an r/whooosh? Because that's how you get an r/whooosh.

[@WilliamSucksAtYT]

@chu Harry r/woooosh

[@timmiddelhoek]

During high school I used this video as a reference for my final paper about the influence of starch on the Briggs-Rauscher reaction, besides being a visual indicator. We got a 9/10. Thank you very much for this vid!

[@Daniellaofsweden]

I remember seeing this reaction for the first time at a field trip to the university. I was around 8 years old, and couldn't stop thinking about it. "What if you dipped a t-shirt in the fluid? Would the reaction continue forever, creating a color changing shirt?" I asked myself for several weeks.

[@Lampe2020]

0:49 At that point in time he didn't know it would become his later profile picture...

[@3possumsinatrenchcoat]

14:16 when you're 10 and discover the powerpoint slide transitions for the first time

[@souravzzz]

The shot of the 4 beakers side by side with slight delay was genius! Keep up the great work!

[@stamasd8500]

Congrats on the silver Play button. But I bet you could have made your own... like Cody. :)

[@NileRed]

I could, but I dont want to copy :). I am thinking of something cool to do as a 100k special

[@Gameboy2218]

NileRed You could grow a crystal copy of the playbutton, w/ copper or iron sulfate. Would be nice to see, but probably also rather difficult to get such a growth mold. You wouldn't copy, and use chemistry for it though. :)

[@darkfur18]

I think something like Alum would be neater to grow, if only because it would be translucent.

[@Daniel-rj2ci]

@@NileRed Make something with thermite

[@notmo.]

And now he's at 3 million subscribers! Time flies by.

[@billsmathers7787]

You only added 5 ml of acid to the liter of solution A. Considering the color of the starting sulfuric acid, it's hard to claim that the color of solution A is entirely due to the acid. A more likely candidate is that your potassium iodate is contaminated with iodide. Under acidic conditions, the iodide and iodate react to form iodine, which dissolves and gives a brownish color. This is also why the color disappears with solution B: the iodine and malonic acid react to form iodomalonate, which is colorless. This side reaction contaminating solution A is why potassium bromate is more common for this oscillating reaction.

[@NileRed]

Very good point! That is also guaranteed the answer.

[@NileRed]

I added a note to the description. Thanks for your input

[@billsmathers7787]

No problem!

[@WalksandAll]

This is my favorite channel on KZbin; the reactions, synthesis reactions and everything else is so interesting to watch keep up the good work and keep inspiring people to love chemistry

[@MetroMellow]

Hi this is a very late reply, i am doing a school project about this, so instead of concentrated sulfuric acid can I use dilute sulfuric acid for solution A?

[@aayushtiru3950]

Best video ever. My science teacher asked me to demonstrate a science experiment at school at an event, he specially asked me to find some very cool reaction to blow the minds off of other school's principals who are also going to be present there. Best demonstration and explanation that too in just 18 minutes. Wish me luck for the demonstration!

[@controllerpleb6568]

Just a cooking tip for corn starch: make sure to always use cold water when dissolving it. It works better for some reason.

[@kindlin]

Probably similar with as with gravy mix. Ever tried to boil the water first an throw in gravy mix? Don't. It'll never dissolve and you'll have the worst clumpy gravy ever. The water _needs_ to be room temp or less.

[@w00154807]

normally I hate youtube reaction videos but this is a clear exception. (wait, now it's black... no it's clear again)

[@AsAboveISoBelow]

The sudden dip from the gold to the dark dark blue really captivated me. It reminds me of the day to night cycle.

[@eduardolaschuk]

I had no success with acetone either. It looks like malonic acid is really necessary for best results. Unfortunately, malonic acid is a bit expensive and is not everywhere easy to purchase. So, I think it would be great to have a video on the synthesis of malonic acid.

[@NileRed]

I got very lucky and managed to snag some on ebay for cheap. The prep of malonic acid is not very economical to do at home. Also, you need NaCN for the typical synth, which is harder to get than malonic acid

[@cyan_oxy6734]

NileRed I think nurd rage made a Video on NaCN starting from urea.

[@Gameboy2218]

Tali-bahn I'm not a professional but i'd still not recommend making sodiumcyanide. It's simply not worth risking getting yourself poisoned for something used in metallurgy and making nitriles.

[@matthewl5009]

Hello! I've heard some chatter that malonic acid could be made by oxidizing malic acid with bleach, both of which are readily available for cheap. If you would investigate that, it would be great. :)

[@rich1051414]

It isn't difficult to buy in my area. A lot of plastics, polyesters, and resins can be made with it.

[@shouldihavelessons]

I don't know why KZbin recommended this but it was the best 18 minutes of video I've watched in a very long time. Absolutely fascinating. Thank you.

[@mm141065]

Finally I find the Briggs-Rauscher reaction explanation, lot of thanks tou you NileRed

[@wbedard]

This is a seriously great video! I was familiar with the iodine clock reaction from college but this one is much more interesting. Thank you so much for all the work in outlining the different chemical mechanisms at work. Wonderful job!

[@NileRed]

I am glad you liked it!

[@andrewmcfarland57]

These videos massage all the science-nerd pleasure centers of my brain. Subscribed.

[@aidenburgess217]

It's good to look back and realise how far Nile has come without becoming a reaction channel.

[@chimkim]

I mean, he technically makes content out of reactions

[@naseemveevers3619]

Thanks for this video, your videos are oddly satisfying!

[@NileRed]

No problem

[@Monjipour]

oddly satisfying videos for chemists x)

[@BenjaminGoldberg1]

Pretty amazing. I wonder what the reaction would look like in a wide shallow container, such as a cookie sheet.

[@timmaassen9234]

Thanks so much! This is by far the best explanation I found in an entire day of research on this topic

[@larsswig912]

15:14 The aurora borealis in the first beaker

[@casandrahampton376]

It's so pretty, like Van Gogh's Starry Night and Starry Night Over The Rhône! I was able to follow the explanation of the chemical reactions, though I had never encountered radical and non-radical as terms or reactions before. I was gratified to notice that I had guessed right about what would be causing the color change at the beginning of the video. I do kinda wish you'd mentioned the changing light wavelengths though. That must also be an interesting chart! Thank you for setting the solutions up in other beakers at the end! At the last showing, the color in the beakers must have oscillated differently because of the pattern the peroxide solution fell into the other and the patterning remained? It was nice to see those differences side-by-side. The furthest left looked like shibori, though I noticed that the clear bands were tinged slightly at their edge yellow. I wonder how the solutions were mixing to cause such clear banding?! And how they move to get to that point to allow it?! Cheers, C

[@tahervasowala8539]

NileRed please do continue making such awesome videos. You explain chemistry in a very neat, organized and simple manner. Great job!

[@richardnlauraclaessens2408]

They could have used this as a movie trick in Star Trek and could have been one of guinins magic drinks

[@ixamraxi]

Would be pretty cool to see the change with a high speed camera.

[@Nemokiddy]

I am in love with oscillating reactions since school 🥰 they are so mezmerising to watch. I love it when reactions look beautiful. 😅

[@AllChemystery]

Brilliant explanation! I have read about this reaction before, but it was hard to follow exactly. but now i definitely have a better understanding of how this works.

[@Patrick_M_O]

For some reason that remind me the vanadium oxidation reaction, one of the most colorful and unique reaction i ever saw.

[@stamasd8500]

Vanadium blue is such a nice color. Wist it were more permanent.

[@moleluvsmakeup309]

I’m not sure why but your videos are oddly satisfying to watch. This one is pretty darn cool on top of that!

[@RedBloopCreature]

These videos are utterly fascinating...

[@hiimii1314]

14:19 I'm slowly getting more and more hypnotized to watch all Nile's videos

[@Gaark]

chemistry is mental :) also, I love the explanation of the cleanup process, it's always at the front of my mind when I watch chem vids

[@ucouco78]

Been trying to get my organic chemistry professor to let us do this.

[@vedritmathias9193]

NileRed NurdRage You need to do a collab called NR2

[@raku2122]

At least take it chemicaly: 2(NR) or 2Nr if you do not like the brackets

[@TG-M-gu3lk]

NR^2 squared

[@kadergumus2598]

@hypernova N-R-N-R'

[@peridotfacet2r7p-5xr2]

YES CALL IT THE AMINO GANG

[@hilalsahin9618]

I don’t understand anything about anything you’re explaining but for some reason I’ve been addicted to your videos 🌟👌🏼

[@aajjeee]

the production of oxygen gas at the bottom is what is stiring it, in the larger becher, the effect of the convection was smaller

[@aajjeee]

also the reaction in the first becher when you have 4 running is amazing

[@shadowhenge7118]

Every time i hear "tri-iodide" i think back to ehen my high school chemistry teacher blew up his fume hood with a bit too much ammonia and iodine flakes.

[@Colonel1954Dz]

I'm curious about the reaction frequency, I expected it to be constant but from the last 4 beaker experiment it looks like some beakers cycle faster than the others. Does it depend on volumes of ABC? or on proportions (I don't think you're pouring exactly 1:1:1 ratios)? Very interesting reaction though, and thank you for the non stirred experiment :3 It was exactly what I was hoping for!

[@StefanReich]

You have a great voice, very sovereign. I actually can't watch a single chemplayer video for the audio reasons. Oh and you explain stuff really well

[@NileRed]

Thanks! Yeah that is unfortunate about chemplayer. If they used a real voice im sure a lot more people would watch

[@stephanieparker1250]

That.. was amazing!! I’ve never seen the reaction when it wasn’t being stirred! 🙌

[@bobfels5343]

Pure art, this looks beautifull!

[@lucidscience925]

Very nice. My student did this as a demo and it absolutely stuns the crowd as well as a good learning moment for radicals.

[@Double0pi]

It's possible that Bill Smathers is correct about the iodide, but I want to add an additional note about coloring in solution A. I've found that most discoloration in acid solutions comes from dissolved metal contamination. It's possible that combining it with the malonic acid produces colorless metal-malonate complexes. Or maybe I'm overthinking this.

[@movax20h]

The Briggs-Rauscher looks to be extremally similar to Belousov-Zhabotinsky reaction. Both also use commonly malonic acid, which I do not know why it is the case. The are also both autocatalitic in both competing reactions. The other details are really mostly accidental, like which indicator to use, or which metal catalyst to use. The difference between using bromine vs iodine, also looks very small. The key understanding is analysis of the kinetics of individual sub-reactions, which can be done quite easily using computer and differential equations. The most important part is the use of catalyst too. Despite a lot of progress in last 50 years, and pretty good understanding experimentally and mathematically what is going on, I feel the oscillating reactions and non equilibrium thermodynamics and non linear kinetics, didn't really progress that much.

[@black_platypus]

It's really nice of you to also include the cleanup afterwards (precautions to disposing)!

[@VoIcanoman]

My AP Chemistry teacher would do this demonstration every Halloween. He'd tell a story and draw a jack o'lantern face on the beaker in which the reaction was conducted. It would turn orange, like a normal pumpkin, and then dark blue (which looks like black, making the black sharpie drawing on the side disappear), and then back to orange. And he timed it exactly so the color changes would coincide with his story. I'm sure that this took several days of tweaking to make it so predictable that he could practise the story and get his speed matched with the reaction. Also, he managed to prolongue the orange phase of the reaction for WAY longer than is demonstrated here...something like 20-30 seconds. So I guess there's a way to inhibit the formation of the tri-iodide ion for awhile.

[@BleachedBlackSocks]

That is amazing! Wow.

[@Astrochellie]

This helped me understand my college chemistry class lab which did this reaction. Thank you nile!!!!

[@DIYHUB]

So interesting! Thanks for the video!

[@kiiometric]

this is awesome, and your are videos too, I love them

[@Chillaskme]

If you were to take a spoonful of it while it's black, would the reaction carry on in that spoon?

[@Amarfa]

If you follow cooking tutorials, you should heat the water first, then take some out, mix the cornstarch with it, and pour it back in, continuing to stir until it thickens slightly. It should be relatively colorless.

[@tom_something]

If you make the solution more viscous, I wonder if that might make the reaction propagate more slowly and create an even more striking effect.

[@therealelizafox]

+NileRed Love your videos! Some suggestions I have: * thiocyanate (turns blood red in the presence of iron (III) ions and blue in the presence of cobalt (II) ions) * chemical chameleon (manganese oxidation state demonstration, although might be a little cliché) * total synthesis of chlorophyll a

[@kabirvaidya1791]

can you pls make a video on lassaign's extract and its test ?? that will be a great deal of help for me in my high school

[@kabirvaidya1791]

pls

[@milojohnson3057]

idk but i love me some lasagna extract

[@bonhomhongon2794]

Fuckin', I thought you were trying to say "Lasagna".

[@tonyzong4185]

Something I dont seem to understand is why we have to mix A and B together before adding C? What products are formed if we add B and C first?

[@GewelReal]

Dark, darker yet darker

[@vecronatt]

photon readings negative. This next experiment seems very, very interesting

[@BamboozietheKing]

It's hilarious most KZbinrs sound more deadpan as time goes on and it seems like you've done the opposite 😂

[@grilledbywebs]

Hey Nile, I'd love to see a synthesis of the compound Geosmin. It's that earthy smell after it rains

[@mamefreak3]

love your videos! I just wonder why sometimes the color changes up from the bottom and sometimes down from the top - Very evident in example with 4 beakers

[@CSGhostAnimation]

Why is it that in some solutions, solids precipitate when the temperature drops, but for others, they make a supersolution?

[@progressivlucushope4ukraine209]

These perpetually color-changing liquid videos are cool.

[@itsaiden4290]

When u add solution B the concentrate decreases which means the yellow color becomes less obvious,and also u can see the color changes back to a yellow-ish color and it becomes visible in a certain concentration when u add solution C…

[@chasefuller8496]

It also works in a petri dish :D Your discovery of the changing reaction rates with exposure to air is very similar to BZ. With the BZ reaction, the bromine evaporates, so maybe iodine is doing the same thing here?

[@candypak7532]

It is the first time I feel that Chemistry can be so much fun after I know about the oscillating process.

[@SgtDanB]

someone's probably already said this but when i make starch solution i bring DI up to a boil first, take the starch and some DI water and make a paste in like a weigh boat, then slowly add the starch paste to the boil DI water while sturring. You get a really clear solution this way. Until it crashes out after a few days.

[@hypnosstratagem1277]

What if you don't add the sodium thiosulfate at the end and just dispose of the solution?

[@NileRed]

You CAN do that, but iodine will corrode pipes and it is not nice to wildlife.

[@dejayrezme8617]

Wow so beautiful! Something like this would make a kickass lava lamp :) Is there a reaction similar to this where you seal it, and add energy to make it continuous?

[@lizzierational8375]

Yo that’s fucking trippy.

[@eriknordquist]

Incredibly beautiful!!

[@etherdark]

Any word on when youll have the beaker mugs back in stock? My wife is a chemist and I would like to get her one for work.

[@jimsmindonline]

Wow, not seen that before, quite beautiful! 👍

[@HUSSURCAN]

thanks for detailed info, great job, cong

[@mattergain]

Great video I do love this reaction. Just a suggestion maybe over long reactions like this you could play some royalty free music. Something calming? Just a thought

[@antonventer8380]

Very well explained thanks!!!

[@ChaosPootato]

Really, REALLY good explanation. Loved the video

[@creativex5617]

Making this tomorrow

[@joshuapatrick682]

How the hell did someone discover this?!

[@WAMTAT]

Through Yeats of careful study

[@fjfeuankcnncne7663]

i wonder what other cool ossilating reaction you could do next

[@NileRed]

Besides the Belousov, i am not sure

[@fjfeuankcnncne7663]

NileRed darn, well i guess it's time for me spend thr night googling about stuff. Thanks for the answer anyways and keep up thr awesome work

[@therealelizafox]

There's always the Gallium beating heart. :p

[@JohnFoley1701]

It would be cool to see some 4k, macro-lens, high speed camera footage.

[@eashaangodbole5410]

It does look better without stirring! Very nicely explained too! :)

[@sageinit]

The oscillation pattern from the graph seems mathematically highly interesting

[@ajrm007]

when iodine sublimes, it is purple, and when it is in solution, it is yellow, why is this?

[@jonasstrzyz2469]

Iodine is in the same group as chlorine. So maybe it is reacting with the water to for HI or something like that.

[@helideon_6408]

Jonas Strzyz that is not possibile since HI is a strong acid so it is completally dissociated

[@jonasstrzyz2469]

I thought that it would dissociate, but I did not know to what extent. My guess is that the reaction would go something like this. I + H2O ---> HI + OH

[@chromecrescent]

I2 is purple in hexane (its natural color) but in other organic solvents it can take on other colors if there is a lewis base that can participate in halogen bonding (bonding of O lone pair and sigma star of I2). When oxygen is the Lewis base, such as in water, I2 becomes brown, as we saw at video's end. Not sure about methanol or other alcohols, though I suspect brown there as well

[@MrStiruam]

As was also mentioned by Slarty: "In solution, I2 typically accepts electrons from the solvent molecule (Figure 3) into its lowest unoccupied molecular orbital (LUMO). This lowers the energy of the transition from the highest occupied molecular orbital (HOMO) of the iodine atom to its LUMO, thereby changing the color from the characteristic violet to brown and other colors. Depending on the electron-donating ability of the solvent, absorption bands are observed from 520-540 nm in hydrocarbon and chlorocarbon solvents, to 490-510 nm in aromatic solvents, and 450-480 nm in alcohols and amines.[8]" -onlinelibrary.wiley.com/doi/10.1002/anie.201100028/abstract-

[@pietrotettamanti7239]

The author of spanish subtitles is Nate Higgers... normally I'm not one to formulate bad thoughts but that name seems unusual to say the least...

[@xAkane0]

This is literally the best video I've ever seen

[@thetimelords911]

How do people discover these things? Who thought of mixing these together?

[@TheGruntonfire8]

me

[@eideticex]

Probably the same way as all of the other scientific novelties. They were trying for something else and this is what happened instead or as part of that process.

[@elsasslotharingen7507]

Ironically, thanks to stupidity. Mistakes are the most common ways things like these are discovered.

[@rusdanibudiwicaksono1879]

"There's no mistakes, only happy little accidents."

[@chocolatecrud]

Beautifully explained

[@NileRed]

thanks!

[@_REVERIE]

You make me wish that I had paid more attention to my 10th grade 'intro to chemistry' class. Very cool videos!

[@angelinamuller5737]

Why do i have the urge to drink it

[@ivnalima3859]

excelent video!! thanks for the explanation

[@cypher237]

"My sulfuric acid got a little dirty..." As it does.... 😊

[@michaelpatrick6950]

The amylose fraction retrograded as the starch paste cooled down. Cooking the starch without high shear and at elevated pressure to get the boiling point up around 230F isn't sufficient to disrupt the amylose fraction of the starch so that it crystallizes as it cools to room temp. If you use potato starch, available at any super market, your paste will not have amylose retrogradation.

[@amciaapple1654]

This is off-topic but this channel seems like a good place to ask this, since many chemistry enthusiasts are here: What substances in the chemist's arsenal are effective in removing black mildew from RTV silicone (the acetate type) ? Sodium Hypochlorite seems to be the popular choice, but what other professional chemicals might be even more effective?

[@collingtech1]

awesome as always , good job mate

[@jeffkubos751]

I grow orchids and I've seen all these color changes in some of them. I fertilized too much and with city water. Thanks. Now I have to figure it out and maybe receive one of those science awards for genius.

[@drstupid1]

I showed my wife and she said " it changes colour a few times but WHAT THE FUCK IS THAT LITTLE SPINNING WHITE THING!!??"

[@jennali9800]

magnet, for stirring. there is another spinning magnet under the paper. so it spins around.