Potassium nitrite from potassium nitrate and lead

About 5 months ago, I performed this synthesis on 1 mole (same as in this video) and 3 mole scales, but I stopped when the potassium nitrite, after adding alcohol and evaporating and repeating this process until the last addition of alcohol, separated in a paste that solidified as a hard chunk when I evaporated to dryness. I think I got annoyed with the process or sidetracked by another project because I still have the two beakers containing the potassium nitrite in plastic bags. In the future video using this procedure except with sodium nitrate, I'm going to use a slightly modified procedure to try and decrease the amount of impurities in the final product. Sodium nitrite should be much more easily isolated than potassium nitrite, so I don't think making the video will take very long. I don't know if I'll get the necessary reagents for the titrations by then, but time will tell.
The procedure also says that when it's required for use, to dissolve 1 part of it in 2 parts of water, cautiously neutralize it with acetic acid, and filter it.
NurdRage's video "Make Isopropyl Nitrite without Sodium Nitrite" • Make Isopropyl Nitrite...
and "Lab Notes - Failure in Making Sodium Nitrite" • Lab Notes - Failure in...
There are several other videos that show the synthesis of isopropyl nitrite using sodium nitrite, an acid, and isopropyl alcohol that I'm not going to link. Isopropyl nitrite burns with a white flame, which is why some people synthesized it.
Apoptosis posted a video showing how he synthesized sodium nitrite from calcium sulfite and sodium nitrate - • Making Sodium Nitrite

[@philouzlouis2042]

Hi ChemDungeon,
Nice video and oxydoredox (of nitrate to nitrite (reduction) and oxydation of lead to PbO).
About your transcient green color, from memory out of a lot of chemical books readings it may be due to polysulfides; of course the brown-red-orange colored stuff is often known as a big bag containg a lot of alike molecules (H2Sx with x integer of various numbers; but when you are more interested into the specific molecules, by have H2S3, H2S4, H2S5, H2S6, H2S7, ... and each has its color shade from yellow to brown; IIRC green is possible.
I like the concept of PbO to be used for Pb(2+); anyone that did try to make Pb(NO3)2 from HNO3 and Pb learn fast that it takes ages to dissolve and build up.
Considering air oxydation of Pb, ih heated, you may get a little PbO2 too as traces and PbO + PbO2 makes the intermediary Pb2O3
I'have got interested into PbO, PbO2 and Pb as possible pathway to perchlorate starting from those as electrodes from NaCl, Na hypochlorite and Na chlorate.
PHZ
(PHILOU Zrealone from the Science Madness forum)

[@williamackerson_chemist]

This is an incredible yield for such a ghetto setup... this is the FIRST nitrate to nitrite video i actually believe got the product.

[@ChemDungeon]

@@williamackerson_chemist gotta love the older methods, they’re often more attainable for home chemists. Working on the sodium equivalent now, it’s going pretty well but the thermal decomp is almost definitely going to lower the yield because it seems like there’s more unreacted lead left over. You don’t trust the calcium sulfite and K/Na nitrate method?

[@philouzlouis2042]

@@ChemDungeon
Theorically there are probably a lot of univestigated "mild" reducer that may do the job.
A bit of search into the field of electrochemistry or oxydoredox could bring a process to light.
Sulfite is in an usual "mild" reducer into organic chemistry; so does polysulfides; probably simple S wil do?
On YT, many have tried to change the lead reduction of nitrates to nitrites (written in old chem books (

[@7hunderstorm242]

Wow very laborious method but well done !
I personally prefer reacting CaSO3 with KNO3 to make KNO2 it's just so much simpler and the yeild is pretty consistent

[@Exotic_Chem_Lab]

I prefer pocket reduction method 😅

[@sergioalvescordeiro9495]

CaSO3 é bem simples e barato de fazer teoricamente! Se eu não estiver enganado, é só queimar enxofre e bombear o SO2 para uma solução de Ca(OH)2, com um misturador ligado para manter o Ca(OH)2 agitando na água.👍👍🍀

[@7hunderstorm242]

@@sergioalvescordeiro9495 es possible de producir le con la reactíon de Na2S2O5 y CaCl2 (lo siento por mi mal Espanol)