NurdRage - 2012-06-24
In this video we're going to make potassium rhodizonate, a chemical for testing the presence of lead. Warning: This synthesis produces toxic nitrogen dioxide gases and handles corrosive acids. This should be performed in a fume hood with gloves. First get 10 grams of inositol and add 25 mL of concentrated nitric acid. With a condenser, reflux the mixture for three hours. Eventually gas production will cease and the mixture should be allowed to cool. Add enough cold water to make the total volume 100 mL. Add an additional 50 mL of glacial (100%) acetic acid. Place the mixture on an ice bath and stir. With continuous stirring, add in 40 g of potassium hydroxide in small portions. Be careful as it will produce a lot of heat and may bubble over. Allow time between each addition to allow the mixture to cool and settle down before adding the next portion. Once all of the potassium hydroxide is added and the mixture is cool. Take it off the ice bath and continue stirring it overnight. Filter out the red potassium rhodizonate precipitate and wash it with 100 mL of isopropanol. Then let it dry overnight. Remove the chunks of potassium rhodizonate and grind them with a spatula into a powder. And then transfer into a vial.
Do you know how to purify acetic acid?
I love this series. Absolutely no handwaving, you can see from step to step to step what's going on and how he does it.
Your videos make me want to pursue science even more than I already want to. Thanks for your uploads. :)
that is so cool! I cant wait for the next video, I want to see you use that :D
I just enjoy watching the reactions and the explanation behind them
Damn, this footage was taken almost two months ago according to the synth date on the vile. He must be really busy! Thanks!
thanks for the reaction equations, they really help
I worked for 20 years in labs at UC Davis. Now that I'm gone, I want to test a ceramic crock for lead and stumbled upon this. I wish I understood chemistry this well! I could follow the protocol easily if I had the reagents.....I miss geeking around in labs.....sigh it would be easier to buy a test kit but this really fascinated me.
I love chemistry, this is a good video. thanks,
i'm still collecting more submissions for the channel redesign contest, i'll post another vlog showing the candidates and how to vote in a week.
even though sometimes these are just too confusing for me, i just love watching the reactions hahah
This so cool! where did you base your protocol from?
Hello NurdRage , Thanks for the information you supplied.
My question is regarding the amount of KOH used. 10 grams of inositol is 0.0555 moles. According to the stoichiometric relation 0.111 moles of KOH (2 * 0.0555) should be sufficient to precipitate approx 13 grams of K-rhodizonate. But you recommend to use 40 grams of KOH which is 0.71 moles. I would like to know the reason of almost 7 fold more KOH. Regards
to shift the equilibrium toward products.
cool, i always wanted to know if there was a good chemical test specifically for lead, thanks!
never cease to amaze!
Ok, When I build my time machine I can send you back to a time before humans used chemistry or physics. It was called the Neolithic era. Great video.
Thanks for your reply! Actually, the lab-evacuation was just for the safety of the other students - i didn´t smell any NOx, but the fumehood (i guess 2x2x0,8 m) was completely filled with brown gas - which looked kinda scary. I already sealed the product into one ampoule, but i could test if it still works. I thought the product was stable in the presence of potassiumacetate and acetic acid?
sounds like there was something wrong with your fumehood. My fumehood handled these gases just fine. I have a fairly good lab but i wouldn't call it superior to most university labs. You might want to suggest to your lab coordinator to have your fumehoods checked.
I love these vids. I miss my ochem class.
I don't understand any of this but I love watching it!
Love the vids, keep up the good work sir.
Most ghetto reflux setup ive ever seen. I LOVE IT!!!
This is awesome.
I want to have the knowledge about chemistry that NurdRage has :(
me too ...I have to finish the 2 exams and I'm ready to do it :D
Yes, but you also need to add in acetic acid to keep the solution below pH 5.
Keep it up. :-)
Great video as always.
Brilliant!!
It's not stable in *air*, which you left it on for a week. In the next video (the actual usage video) i state it only lasts for an hour once dissolved. We precipitate out here so that its stable in solid form but its still oxidizing in solution. as some gets oxidized more of it dissolves back into solution. eventually you destroy it all. The trick is to make it faster than it gets destroyed. Thus i specify one night, not one week.
Very interesting thanks!
good job as always
I've finished college. I'm a Microcomputer Engineering Technologist. Cheers! =)
Excelente
Do a tutorial on creating highly pure Methamphetamine.
Great video~!
though i do agree with you, there is one major diffirence in how a chemist and a physisist looks at the molecular level.
ok, that i can explain ^_^, DDT is made by boiling together trichloroacetyl aldehyde and chlorobenzene in sulfuric acid and then washing the product with water. The problem is the precursors themselves aren't easy to get or to make with home chemsitry. So i don't think attempting it for pest control would be a good idea. Also the chemicals are somewhat toxic and the DDT itself is known to have health hazards. So I probably wouldn't be doing it myself since I don't have a need for DDT.
good video!!!! you must do a video about making aerogel !!!
Great video, I never do this because I prefer doing things that usually don't kill me if I mess it up royally, but I really enjoy your videos! Keep it up, it entertains the masses!
I'm working on a background, logo, and intro for u :D
Your videos are so cool!
Yea... just acquire a nuclear reactor, and neutron-active some lithium-6. This is possible with neutrons of any energy, and is an exothermic reaction yielding 4.8 MeV. Problem sorted.
Hello NurdRage
Is possible to make tetrahydroxibenzoquinone fron inositol?
I have no idea what are you doing but it's fascinating :D
are you ever going to do a special video where you lab lets you use hydrofluoric acid?
I stand by my statement. Chemistry is physics. I care not what you think. ;)
Do not underestimate the production of NOx ! I tried this with 10 grams of inositol under a fumehood at the university. At about 120-130 °C the mixture began to boil and large amounts of NOx got free. I turned off the oil bath and sinked it down, but the reaction couldn´t be stopped. The fumehood (which got a really good exhaustingpower) couldn´t handle these amounts, and the lab had to be evacuated. I quickly grabbed a gaswashing-machine with Na2CO3, to get rid of the toxic fumes.
C6 H12 O6 is gluten, right? I'm starting to learn this in school! :D
gluten is actually a protein. Polysaccharides , such as starch and cellulose, are dehydrated polymers of glucose, which has the same formula, but no this is a different structural isomer, inositol.
GREENPOWERSCIENCE - 2012-06-28
GREAT VIDEO perfect solution!