На главную страницу сайта Опыты по химии Химический Юмор. Научный Юмор Опыты по физике    



Форум Химиков - Энтузиастов. Химия и Химики

Эксперименты по Химии - Практическая Химия - Книги по Химии - Физика – Астрономия – Биология – Научный Юмор
Прежде чем отправить свое сообщение - ознакомьтесь с ПРАВИЛАМИ ФОРУМА.
Прежде чем создать новую тему - воспользуйтесь ПОИСКОМ, возможно, аналогичная тема уже есть

All times are UTC [ DST ]




Post new topic Reply to topic  [ 6348 posts ]  Go to page Previous  1 ... 309, 310, 311, 312, 313, 314, 315 ... 318  Next
Author Message
 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 13:55 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
but if nitric acid can oxidize it to 4, now I remind it can oxidize 4 to 6, so the final product will be anyway uranyl nitrate. as you say I can use metal.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 15:08 
Online
.
User avatar

Joined: 04 Nov 2009 22:05
Posts: 62193
Location: Моя Батьківщина там, де моя лабораторія
Salts of uranium (IV) are reducing agents. Nitric acid will oxidize uranium (IV).
____________________
Dissolution of uranium dioxide in nitric acid media: what do we
know? // EPJ Nuclear Sci. Technol. 3, 13 (2017)

Attachment:
epjn160007.pdf [1.24 MiB]
Downloaded 65 times

_________________
Думайте!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 16 Sep 2022 16:03 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
thank you! I made it. I'll upload videos&photos on the U topic.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 18 Sep 2022 01:32 
Offline
Модератор
Модератор

Joined: 23 Feb 2012 03:01
Posts: 1549
"Hello, I had a jar of 3,3'-Diaminobenzidine," - vano34

If You want to purify this reagent try to use an appropriate method for a photographic developer (metol, sulfate salt of N-methylaminophenol, or a similar substance). I suppose its water solution with sodium metabisulfite may be purified by activated carbon unless oxidation has gone too far. Usually polyamines oxidizes by air very easily (acid salts are more stable), in industry waste TNT in large amount of water reduces into triamine which then oxidizes by air with benzene ring break.

Sorry for no answer in Private Messages - computer is malfunctioning. You may send me Your e-mail for this case in PM, I will try to write.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 18 Sep 2022 09:30 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
thank you so much Ing.P. !


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 20 Sep 2022 14:37 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
hello! does anyone has any information about Ti(III) inorganic complexes, I found only organic complexes. in m soviet books there are not complexes, only compounds. also, my starting material is titanium trichloride.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 20 Sep 2022 16:38 
Offline
Гуру
Гуру
User avatar

Joined: 16 Mar 2018 11:06
Posts: 3397
Location: My homeland is where my laboratory is
I think that such complexes are low stable. They can exist in dynamic equilibrium with ligangs

_________________
Думайте!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 20 Sep 2022 17:30 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
thanks! I want to make Ti(III) selenite, I made this reaction in a test tube, I added titanium trichloride solution in sodium selenite pentahydrate solution, and I saw colorful precipitate, ill make solid salt today. just i didn't find information about this salt. is it Ti2(SeO3)3, what do you think?


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 20 Sep 2022 17:48 
Online
.
User avatar

Joined: 04 Nov 2009 22:05
Posts: 62193
Location: Моя Батьківщина там, де моя лабораторія
Ti(III) can reduce Se(IV) to Se(0).

_________________
Думайте!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 20 Sep 2022 17:57 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
yes but, I have made red allotropy many times, from my experience the allotropy looks different. so ill dry this precipitate and put it under sunlight. if it turns black it is red allotropy, so if it isn't, then that is selenite.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 21 Sep 2022 14:01 
Online
.
User avatar

Joined: 04 Nov 2009 22:05
Posts: 62193
Location: Моя Батьківщина там, де моя лабораторія
I hope you are wright.

_________________
Думайте!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 21 Sep 2022 17:48 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
today I dryed it under sunlight, still red color. interesting is this selenite? but there is not red selenium I'm sure, today was a very sunny-hot day, the last time when I made red selenium, I dryed it under sunlight, and it turns black form in 30 minutes. just im surprised why nowhere is information about that compound.


Attachments:
IMG-2374.jpg
IMG-2374.jpg [ 1.99 MiB | Viewed 3992 times ]
IMG-2373.jpg
IMG-2373.jpg [ 3.39 MiB | Viewed 3992 times ]
IMG-2376.jpg
IMG-2376.jpg [ 1.41 MiB | Viewed 3992 times ]
IMG-2380.jpg
IMG-2380.jpg [ 1.33 MiB | Viewed 3992 times ]
Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 21 Sep 2022 19:16 
Online
Гуру
Гуру

Joined: 24 Mar 2010 12:56
Posts: 1253
Location: צפת
Both titanium compounds and most selenites are colorless. It looks like a mixture of titanium hydroxides (4) and selenium (0) .


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 21 Sep 2022 20:08 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
thank you! but red selenium turns black under sunlight it needs just minutes. I'm not sure as I said. I can't make any analysis now. also, I don't like when I have chemical and I don't know exactly what it is. I think the best idea now is to make some TiO2*nH2O, ill add nitric acid, the final product anyway will be oxide hydrate. also, I always wanted a hydrated form of the oxide, I have dioxide but because it is calcinated at high temperatures I can't make anything from it.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 21 Sep 2022 23:44 
Online
Гуру
Гуру

Joined: 24 Mar 2010 12:56
Posts: 1253
Location: צפת
You can try to treat the substance with carbon disulfide or benzene. Selenium should dissolve.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 22 Sep 2022 08:18 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
thanks!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 01 Oct 2022 19:43 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
Hello! I tried to make europium sulfamate, but it was hard to remove the compound from the flask, so I dissolved Eu sulfamate in water and add sodium selenite (exec) to make Eu selenite. I added CuCl2*2H2O to the filtrate, it dissolved rapidly. the solution was clear, and after an hour I saw some blue crystals.

Then I made a sulfamic acid sodium selenite solution mixture added some copper chloride and I got the same crystals. copper selenite is very insoluble it forms powder instantly, I never saw Cu selenite crystals and copper sulfamate is soluble and has a darker color. I have no idea which compound it is, but when I burnt it with a flame torch, I saw the vapor of red selenium and smell its unpleasant odor. this fact means that it contains selenite anion.

crystals are insoluble in water, I also try boiling water.

here are photos.


Attachments:
308069646_508835437276527_7110591862003507157_n.jpg
308069646_508835437276527_7110591862003507157_n.jpg [ 361.51 KiB | Viewed 3564 times ]
308211740_1490529004761639_5176419558640225678_n.jpg
308211740_1490529004761639_5176419558640225678_n.jpg [ 629.78 KiB | Viewed 3564 times ]
Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 01 Oct 2022 20:02 
Online
.
User avatar

Joined: 04 Nov 2009 22:05
Posts: 62193
Location: Моя Батьківщина там, де моя лабораторія
Sulfamic acid is strong. It may increase the solubility of copper selenite. More solubility - bigger crystals.

_________________
Думайте!


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 01 Oct 2022 20:40 
Offline
Участник
Участник
User avatar

Joined: 14 Jul 2021 12:13
Posts: 333
Location: Georgia
good idea. yes if we add sodium selenite in a copper salt solution, it precipitates instantly and when I added copper chloride to the mixture it was a blue clear solution. so insoluble copper selenite is more soluble in sulfamic acid solution and crystallizes slowly. ill try if I make bigger crystals.


Top
 Profile E-mail  
 
 Post subject: Re: Нуждаюсь в совете
PostPosted: 02 Oct 2022 06:03 
Offline
Гуру
Гуру
User avatar

Joined: 24 Nov 2009 12:17
Posts: 10420
Location: Новосибирск
viewtopic.php?p=175565#p175565

_________________
- Не люблю тех, которые вслух произносят один тост, а про себя думают другой.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6348 posts ]  Go to page Previous  1 ... 309, 310, 311, 312, 313, 314, 315 ... 318  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 98 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

[Сообщить об ошибке, испорченном вложении, битой ссылке]
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group