I made chromium trioxide by straight away adding concentrated Sulphuric acid to solid Potassium Dichromate and even that method worked as well, also less Sulphuric acid will be used in that method (without water)
I use to use this compound when I was a kid in my pyro compositions. My father use to bring home chemicals for me from work, and this was the last one he brought home. As you know it has a low melting point, and I accidently dropped it all over the carpet. He was pissed and that was the end of my fire work days lol. I still cant believe he brought these chemicals home for a 12 year old as they are so poisonous. I loved the bright white the compositions would burn with this mixed in. Great video, thanks for the synthesis for this, I always wondered how to do it.
My school used to encourage kids to make model volcanoes out of Ammonium Dichromate which spewed green chromium oxide ash all over the place. In today's times, that kid would be suspended indefinitely, the parents prosecuted, and the school would be locked down for 6 months to clean up a hazardous waste release. I wonder how many kids got cancer from such "science projects"?
196Stefan2 No, the chromium trioxide with rapidly oxidize any compound with carbon in it, including acetic acid. Acetic acid is a weak acid anyways, it would shift the equilibrium away from CrO3 to dichromate. You need a volatile inorganic strong acid with low water content. Nitric acid is one of the only acids that satisfies this. HCl also can’t be used cuz of water content but also, using it will generate chromyl chloride.
Dear Doug, I'm trying to figure out if low voltage electro-etching of chromium-bearing steels produces Cr(VI) in any form (such as CrO3) but I have no idea how to figure this out. There seems to be a lot of conflicting info out there. My method of electrolysis will be using aqueous iron (II) sulfate as the electrolyte, a hunk of low carbon steel as the cathode and stainless steel (to be etched) as the anode. Your insight here is SUPER appreciated... I'd love to know as much about this as I can above any beyond the Cr(VI) concerns. Best, George
With the nitric acid washing step, is there not a concern that mixing the conc. H2SO4 and HNO3 together would make an in-situ nitrating mixture and nitrate the filter material to create chromium-heavy nitrocellulose waste?
You are right, but the filter he is using isn't made of cellulose. He is using a fritted glass filter, which is made out of glass. By the way, you can't use a cellulose filter because the sulfuric acid/chromium trioxide mixture will destroy it. Edit: grammar
I assume chromium trioxide added to neutral water makes straight chromic acid free of alkali metals available to react with other bases to make other chromates correct?
nitric does not corrode stainless steel. actusply it is sold in stainless carboys and kegs. it is also used to passify stainless. funny enough, one method of passifying stainless is nitric 10% with potassium dichromate and water. this is done particularly after welding stainless make more videos!
would hydrogen peroxide work in place of sulfuric acid as an oxidiser? and would this increase the yield because sodium hydroxide creates a basic solution this would then favor the CrO3 equilibrium to convert all CrO3 and preciptate it out of solution. I want to make this without H2SO4 please reply if you think this could work
You started with 100 g of Na2Cr2O7-2H2O which was 0.335 moles. A 100% yield of CrO3 would be 67 grams,so your product must have been still WET or MIS-weighed-whatever! Otherwise, I liked your technique and this video!
I know the waste only has a few ml of HNO3 but you can distill it out and just leave the sulfuric acid and chromic acid behind for your glass cleaning endeavors
you know, you could have saved HEAPS of sulfuric acid by adding only enough water to made a paste, or, even at only 93 percent , you could have just added the acid with no water at all, and then you would have only used 100 mLs or so...
no, because although it will move the pH down , it still does not have the oxidising and dehydrating properties that sulfuric does, look at the equation..it is more than just a simple change in pH
@@pietrotettamanti7239 no. pure fuming concentrated hydrochloric acid wouldn't make chromyl chloride. to do that you would need a very strong and acid compatible drying agent, like sulfuric acid or phosphorous pentoxide.
Yeah better not. Actually i prepare some experimentation about metalothermic reduction of CrO3 with Al powder but i hit the bump of 7052.26 J/g specific heat for that reaction compared to the 2600 and some change for Cr2O3. I wonder if we can mix CrO3 with Cr2O3 for reduced heat output. Because it seemed as quite dangerous.
Yes you can make thermite with that. There' s only one problem: you mix it with the powdered reducing agent and boom the mixture self ignites (tried with aluminium and magnesium on a small scale just for fun)
You must not have used it much then. I've removed stuff from glassware with chromic acid that no concentration of HNO3 would touch. Either that, or your chromic acid solution was either used up, no good to start with or not made right.
sorry i read your comment wrong . i read the response to your original comment and got the two mixed up and i thought you were looking for nitrates. why i dont like making comments on youtube easy to make an ass of yourself
I made chromium trioxide by straight away adding concentrated Sulphuric acid to solid Potassium Dichromate and even that method worked as well, also less Sulphuric acid will be used in that method (without water)
I like your method better!!!
but there is bisulfate precipitation problem with that
I use to use this compound when I was a kid in my pyro compositions. My father use to bring home chemicals for me from work, and this was the last one he brought home. As you know it has a low melting point, and I accidently dropped it all over the carpet. He was pissed and that was the end of my fire work days lol. I still cant believe he brought these chemicals home for a 12 year old as they are so poisonous. I loved the bright white the compositions would burn with this mixed in. Great video, thanks for the synthesis for this, I always wondered how to do it.
Hope that carpet was cleaned with a ton of sulfite.
My school used to encourage kids to make model volcanoes out of Ammonium Dichromate which spewed green chromium oxide ash all over the place. In today's times, that kid would be suspended indefinitely, the parents prosecuted, and the school would be locked down for 6 months to clean up a hazardous waste release. I wonder how many kids got cancer from such "science projects"?
its the only video in entire youtube about cr03 thank you.
You are wrong. There's another video about it from periodic videos. It's been up since 2012.
and this chanel called sonomo
7 billion people all sons of god
Explosions & Fire has CrO³ on his channel.
"Tang... it's not just for breakfast anymore"
"Of course goggles are a must here"... Well said!
Come home man, we need you
I miss you, Doug!! I pray you are just locked up and not dead
Doug! After washing with hno3 , is there perhaps a desiccant that I could store it next to in an old non functional vacuum chamber pot?
By the way, in a "all reagents are available" kind of scenario, could you fully dry the CrO3 using thionyl chloride?
Yup that works. Also washes the sulfuric acid away, you are left with bright red chromium trioxide.
What program are you taking for video editing??
I use this compound every morning with milk juice and toaste!
Beautiful! Loved it!
the only way i found out about this is because there is an abandoned factory with vats of these types of compounds in them :/
9:47 In order to get rid of the H2SO4, could the HNO3 in the washing step be replaced by Glacial Acetic Acid?
196Stefan2
No, the chromium trioxide with rapidly oxidize any compound with carbon in it, including acetic acid. Acetic acid is a weak acid anyways, it would shift the equilibrium away from CrO3 to dichromate. You need a volatile inorganic strong acid with low water content. Nitric acid is one of the only acids that satisfies this. HCl also can’t be used cuz of water content but also, using it will generate chromyl chloride.
can u please upload a video of cumene process(hock process) for phenol synthesis?
Dear Doug,
I'm trying to figure out if low voltage electro-etching of chromium-bearing steels produces Cr(VI) in any form (such as CrO3) but I have no idea how to figure this out. There seems to be a lot of conflicting info out there.
My method of electrolysis will be using aqueous iron (II) sulfate as the electrolyte, a hunk of low carbon steel as the cathode and stainless steel (to be etched) as the anode.
Your insight here is SUPER appreciated... I'd love to know as much about this as I can above any beyond the Cr(VI) concerns.
Best,
George
With the nitric acid washing step, is there not a concern that mixing the conc. H2SO4 and HNO3 together would make an in-situ nitrating mixture and nitrate the filter material to create chromium-heavy nitrocellulose waste?
You are right, but the filter he is using isn't made of cellulose. He is using a fritted glass filter, which is made out of glass. By the way, you can't use a cellulose filter because the sulfuric acid/chromium trioxide mixture will destroy it.
Edit: grammar
I assume chromium trioxide added to neutral water makes straight chromic acid free of alkali metals available to react with other bases to make other chromates correct?
I think so but I too am not sure about it.
nitric does not corrode stainless steel. actusply it is sold in stainless carboys and kegs. it is also used to passify stainless. funny enough, one method of passifying stainless is nitric 10% with potassium dichromate and water. this is done particularly after welding stainless
make more videos!
would hydrogen peroxide work in place of sulfuric acid as an oxidiser? and would this increase the yield because sodium hydroxide creates a basic solution this would then favor the CrO3 equilibrium to convert all CrO3 and preciptate it out of solution. I want to make this without H2SO4 please reply if you think this could work
Can i use potassium dichromate if that's all i have?
What's the chart called that he used? I'm curios about what a sulfide one would look like
Hey Doug can I use ammonium dichromate instead of sodium dichromate
You started with 100 g of Na2Cr2O7-2H2O which was 0.335 moles. A 100% yield of CrO3 would be 67 grams,so your product must have been still WET or MIS-weighed-whatever! Otherwise, I liked your technique and this video!
I know the waste only has a few ml of HNO3 but you can distill it out and just leave the sulfuric acid and chromic acid behind for your glass cleaning endeavors
I found you through Thoisoi!
Can you try and make unstable Chromium pentoxide with diethyl ether and potassium dichromate
Where to buy chemical reagents?
Hi,how to make potasium cyanide to ammonia and potassium hydroxide?
why cant you just dissolve the sodium dichromate in a less concentrated sulfuric acid that is also chilled instead of dissolving it in water first
I don't think it dissolve very well in Sulfuric
you know, you could have saved HEAPS of sulfuric acid by adding only enough water to made a paste, or, even at only 93 percent , you could have just added the acid with no water at all, and then you would have only used 100 mLs or so...
Righty so! At least 93%
Yup no water is needed, and even wierder it likes to float to the top as glitzy red crystals. 😁
Why use the microwave instead of the hot plate it's already on?
nice man! react Cr2O3 to display its reactivity for me? I have a bunch and I'm having problems getting it to trivalent chloride salt
Great video! i will be donating also thanks!
Would it not be cheaper to replace the expensive sulphoric acid with something cheeper like hydrochloric acid?
no, because although it will move the pH down , it still does not have the oxidising and dehydrating properties that sulfuric does, look at the equation..it is more than just a simple change in pH
psycronizer Wouldn't it also make chromyl chloride?
ScienceWithJames yes
@@pietrotettamanti7239 no. pure fuming concentrated hydrochloric acid wouldn't make chromyl chloride. to do that you would need a very strong and acid compatible drying agent, like sulfuric acid or phosphorous pentoxide.
And that kiddies is how real men start fires
dude did that oxidation at 16:41 actually crack that vessel?! ok I see it didnt. whew
good vid
Still going Doug?
Hey dude, could we just use 68% HNO3 instead of the H2SO4
I think you probably could, but why? Sulfuric acid is probably easier to get.
because you need a dehydrating acid with little water in it (like 98% sulfuric acid).
@@Molko701 oohk
@@chickenspaceprogram thats very difficult to get in my country
@@venkatsharma05 Some drain cleaners are over 90% sulfuric acid.
Can you do a video on making Shvo Catalyst?
Orange cancer juice and h2so4: red cancer juice.
Add more h2so4: red cancer explosive.
hello, i have 2 parts of pure chrome metal 99,8% (Cr2O3+2Al -> 2Cr+Al2O3) can i extract cro3 from this metal?
So much nasty stuff at once. Great video.scary
Can you make thermite with it?
Better you don't, it could be quite explosive! I'd prefare Cr2O3 instead...
Yeah better not. Actually i prepare some experimentation about metalothermic reduction of CrO3 with Al powder but i hit the bump of 7052.26 J/g specific heat for that reaction compared to the 2600 and some change for Cr2O3. I wonder if we can mix CrO3 with Cr2O3 for reduced heat output. Because it seemed as quite dangerous.
196Stefan2 no gas are produced in that reaction. So, surely it'd be fast and dangerous, but it'd be more like a flash, not an explosion.
Yes you can make thermite with that. There' s only one problem: you mix it with the powdered reducing agent and boom the mixture self ignites (tried with aluminium and magnesium on a small scale just for fun)
Where to buy Chromium trioxide?
Onyxmet
Percentage yield?
its soo orange.....i want to drink it.....can i drink it?
+Steve Johnson i dont think cancer would be a concern on account of dying pretty fast.
You can drink it! Only once though.
anyone else see dougs face and the camera in the reflection of the round bottom flask at 12:53?
The water addition is not needed just add sulfuric acid.
that stuff is very toxic, ain't it?
Yes, except from this, it is carcinogenic, a strong oxydizer, very hazardous to the environment, and can cause allergies. Nasty stuff!
@@196Stefan2 dang lol
I found red fuming nitric or piranha solution best for cleaning glassware. I was never that impressed with chromic acid cleaning solution.
You must not have used it much then. I've removed stuff from glassware with chromic acid that no concentration of HNO3 would touch. Either that, or your chromic acid solution was either used up, no good to start with or not made right.
Thank you very much wait more
Why is the vacuum pump so loud?
It's a rudimentary vacuum pump using flowing water to create the vacuum. A motorised vacuum pump would still be loud just in a different way.
It's a rudimentary vacuum pump using flowing water to create the vacuum. A motorised vacuum pump would still be loud just in a different way.
***** So kind of like ChemPlayer's vacuum pump?
***** Uh...Okay, there's absolutely no sarcasm in that whatsoever... *facepalm*
Hi , you are good in chemistry. Can you make a video where you show how to produce HF ?
You can really tell that the original commenter has never worked with HF and doesn't know how dangerous it is.
Couldnt you just burn the metal itself in air?
Boomaranch no
I guess this method makes sodium trichromate Na2Cr3O10
why ?
good
how can i purify red h2so4 from drain cleaner?
Drain cleaner utilizes a caustic alkali metal hydroxide such as sodium hydroxide. Nitrates wouldn't be found in something like that.
no.i seen drain cleaner 98%H2so4 but is red,,,i don t know what is these...
+ionel anonimul where do you see nitrogen in H2SO4 ? i just see hydogen sulfer and oxygen?
+tom long where do you see i say about nitrogen?i jusk ask how to clean drain clener h2so4
sorry i read your comment wrong . i read the response to your original comment and got the two mixed up and i thought you were looking for nitrates. why i dont like making comments on youtube easy to make an ass of yourself
SPEEK SLOWLY
*SPEAK
2:50 chromate is actually 2-, not just -
And Chromic Acid is H2CrO4 - not HCrO4
hi please there is no voice
Nice video, try speaking a bit slower, please.
I'd leave it stirring whilst cooling. don't understand why people do what you do, it's silly.
It needs to be still so the crystal size can be larger
parlez doucement, je n'arrive pas à suivre