The red color the melt takes on is actually from potassium chromate itself. It's a little known fact, but the salt is thermochromic, changing towards orange or even red at high enough temperatures.
@THYZOID
2 жыл бұрын
That’s interesting. Thanks for letting me know!
@LiborTinka
Жыл бұрын
I found it more convenient starting from chromium hydroxide or chromium metal - the metal is very hard but can be shattered to small pieces by hammering in a covered steel mortar. It is then dissolved in acid and oxidized. Dichromate of sodium is valuable due to it's high solubility while that of potassium as a standard. I found one patent on preparation of sodium dichromate using sulfuric acid, the excess acid being removed as sodium sulfate and the excess sodium as bicarbonate (by bubbling CO2 through the mother liquor). I've look up preparing sodium dichromate from potassium dichromate - this might be done by removing potassium as iodate (the potassium iodate is even less soluble than potassium dichromate). However once we have the potassium salt, it's cumbersome to get the sodium salt as most potassium salts are too soluble and we would have to go through chromium trioxide, back through chromium hydroxide or oxide or maybe even through chromyl chloride.
@EdwardTriesToScience
2 жыл бұрын
Love the burner design, it's like a larger version of a blowgun, the furnace seems easy to make too, I might make a small one
@LabCoatz_Science
2 жыл бұрын
Great video! Have you considered the very similar permanganate synthesis? I know manganese dioxide is pretty widely available (I purify mine from alkaline batteries), and permanganates don't seem to be nearly as toxic as chromates and dichromates, so it might be worth a shot!
@EdwardTriesToScience
2 жыл бұрын
NurdRage has a video on it, there still is no good breakthrough in making potassium permanganate in lab scale though. The main problem is that you can't easily get it to crystalize as any organic impurities whether that be fibers from your filterpaper or the oil droplets that are naturally in the air
@THYZOID
2 жыл бұрын
The permanganate synthesis is another great idea! I also might try to make ferrate too.
@chemistryofquestionablequa6252
2 жыл бұрын
Check out water filter stores, I bought ten pounds of potassium permanganate at one ten years ago for $60. Needless to say, I still have at least three quarters of it still. It's super useful, but you rarely need much.
@midwestchem368
2 жыл бұрын
Great video man! I dig the furnace that's really cool to have sort of a hybrid style there.
@THYZOID
2 жыл бұрын
Thank you!
@BalticLab
2 жыл бұрын
Finally! Been waiting on this video since you posted pics on Instagram. Gonna watch it now and compare to my own experiment.
@BalticLab
2 жыл бұрын
Okay, looks like you had the same filtering issues that I had. I even tried a glas fritted (40 micrometer) Buchner funnel with filter Paper in it but even that pulled through some chromium oxide at first. I regret using that glas fritted Buchner because it's permanently green now. Even after leaving it in H2SO4 + H2O2 over a week.
@chemistryofquestionablequa6252
2 жыл бұрын
Extracting the nitrite from this synthesis could be interesting too, it's hard to get in some parts of the world. I guess they don't want us making tetrazoles, or GHB.
@THYZOID
2 жыл бұрын
I´ll turn it all to NO2 but a video on making nitrites should follow in the future!
@joeylo2302
Жыл бұрын
Wash the yellow crystals with ethanol to get rid of the potassium nitrite.
@FullModernAlchemist
2 жыл бұрын
You may want to consider using Celite in your vacuum filtration setup it will catch those first very small particles that got through the filter paper.
@WeebRemover4500
2 жыл бұрын
interesting, a hotplate should do well for this with some aluminium oxide insulation, and the Cr2O3 may be recycled.
@LiborTinka
Жыл бұрын
Also be aware of the airborne droplets! Always cover the reaction vessel with e.g. glass wool.
@hanleypc
2 жыл бұрын
'I don't want to risk getting my beaker contaminated so i'll use this mixing bullet.....' A bit of chromium smoothie never hurt anyone lol
@kalrbaum
2 жыл бұрын
Isn't Chromic acid recommended for cleaning glasware in 60s Lab Manuals?
@chemistryofquestionablequa6252
2 жыл бұрын
@@kalrbaum yeah, it's badass for organic residue!
@hegedusmarton8485
2 жыл бұрын
Potassium dichromate have a lot lower solubility than potassium chromate, so if you acidified the (COLD) filterate with acetic acid, collect the dichromate crystals, redissolve it and basify the solution, then let it evaporate, the yield would be a bit higher i guess. That's how I'm making mine, I just don't basify the solution just but recrystallize it, because I use dichromate. Btw good video! New sub!
@THYZOID
2 жыл бұрын
If you acidified this solution you would get a lot of nitrogen dioxide.
@lborate3543
Жыл бұрын
Can we have a moment of silence for the Buchner filer?
@chemicalmaster3267
2 жыл бұрын
@ THYZOID LABORATORIES Quite funny, I actually thought you would do a video on extracting chromium in the form of a chromate or dichromate salt from stainless steel. That could also be quite interesting. And by the way, if you want to make potassium dichromate from that potassium chromate and potassium nitrite, you will have to deal with the latter somehow, otherwise you won´t get potassium dichromate and instead you will reduce the Cr(VI) into Cr(III) when you acidify the solution.
@THYZOID
2 жыл бұрын
That one is still planned! Don’t have a lot of stainless steel flying around rn though.
@chemicalmaster3267
2 жыл бұрын
@@THYZOID No worries! And another thing, if want a much better and cleaner way to make potassium nitrite, you can melt a mixture of potassium nitrate and potassium hydroxide and then carefully add little bits of sulfur at a time. 3 KNO3 + 2 KOH + S = 3 KNO2 + K2SO4 + H2O
@chemistryofquestionablequa6252
2 жыл бұрын
@@THYZOID You can get cheap stainless steel cutlery at second hand stores for really cheap. I'm sure you could buy enough for the synthesis for less than twenty dollars.
@dexterflodstrom9975
2 жыл бұрын
Awesome video as always
@ChemTalk
2 жыл бұрын
Nice job!
@SodiumInteresting
Жыл бұрын
How do you make and print your labels, do you create an image in an app and load onto a handheld sticker printer? I was thinking of getting one of those
@THYZOID
Жыл бұрын
this one was made using microsoft word and a piece of clear scotch tape
@noodlesoup2281
2 жыл бұрын
Awesome furnace!! ❤️ What did you coat the inside with? Also I have wanted to ask when using the gas cylinder is there any chance of suck back when using it like that?
@THYZOID
2 жыл бұрын
The inner layer is called schamott. Suck back? You mean if the flame can go inside?
@rainwater397
4 ай бұрын
Can this reaction be performed in aqueous solution instead of a molten salt?
@THYZOID
4 ай бұрын
no
@chanheosican6636
2 жыл бұрын
Interesting but what does the potassium nitrate exactly do?
@THYZOID
2 жыл бұрын
We need it to oxidize chromium(III) to hexavalent chromium. Any other oxidizer, even air, would work.
@JustinKoenigSilica
2 жыл бұрын
hell yeah, cancer, let's goooo what happened to the silica nanoparticles? any update on that?
@THYZOID
2 жыл бұрын
I honestly forget about that one but this is something I must definitely try! Just took a screenshot of your comment as a reminder.
@kenbrady119
2 жыл бұрын
Can some chemicals be dried in a microwave oven?
@THYZOID
2 жыл бұрын
Very few chemicals. Not chromates though and definitely nothing in the kitchen microwave
@roman091000
Жыл бұрын
nice one
@roman091000
Жыл бұрын
is it a long process of making the same thing from a chrom powder (actual metall)?
@THYZOID
Жыл бұрын
the process from Cr metal is easier and faster
@roman091000
Жыл бұрын
@@THYZOID i would like to see the whole process of it
@THYZOID
Жыл бұрын
@@roman091000 i won´t try it. I have more chromate than i´d ever need and videos of this process already exist
@roman091000
Жыл бұрын
@@THYZOID ok, thanks. what do you planning to do in your next making video?
@MichaelLapore-lk9jz
11 ай бұрын
Did you go out of your way to find the most pain in the ass way to synthesize potassium chromate?
@THYZOID
11 ай бұрын
This way is acceptable. From stainless steel is much worse
@galaxymyt4834
7 ай бұрын
Make potassium citrate
@Cristi0986
2 жыл бұрын
Your potassiun chromate shouldn't be yelow?
@THYZOID
2 жыл бұрын
Shouldn’t be green
@Cristi0986
2 жыл бұрын
@@THYZOID here ar yelow kzitem.info/news/bejne/qHiLmJOsg4BzknY
@karolus28
Жыл бұрын
cool
@ruchishinde8875
2 жыл бұрын
TV
@galaxymyt4834
7 ай бұрын
M
@alllove1754
Жыл бұрын
This reminded me of the kmno4 make on chemplayer. Thank you for the nitrate method.. makes me wonder is there is a nitrite method...
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