why one hour of stirring is necessary?
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| Нуждаюсь в совете http://www.chemistry-chemists.com/forum/viewtopic.php?f=9&t=123 |
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| Author: | vano34 [ 10 Sep 2022 12:01 ] |
| Post subject: | Re: Нуждаюсь в совете |
yes, i think so, thank you! also bismuth complex started decomposition, unfortunately. |
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| Author: | vano34 [ 10 Sep 2022 22:22 ] | ||
| Post subject: | Re: Нуждаюсь в совете | ||
why one hour of stirring is necessary?
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| Author: | Volodymyr5 [ 11 Sep 2022 09:32 ] |
| Post subject: | Re: Нуждаюсь в совете |
Probably, the slow addition of Na2S2O8 is needed. |
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| Author: | vano34 [ 11 Sep 2022 11:59 ] |
| Post subject: | Re: Нуждаюсь в совете |
yes maybe, I added it in portions but nothing happened, then I add exec persulfate, and left it a night but still a clear green solution. |
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| Author: | Volodymyr [ 11 Sep 2022 12:50 ] |
| Post subject: | Re: Нуждаюсь в совете |
Persulfate may decompose during storage |
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| Author: | vano34 [ 11 Sep 2022 13:15 ] |
| Post subject: | Re: Нуждаюсь в совете |
yes, you are right, but I made Cu(III) with the same persulfate month ago, I post it here as I remember this periodate complex. ill try this reaction at second time when i go to lab. |
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| Author: | newann [ 12 Sep 2022 16:08 ] |
| Post subject: | как получить гладкий шар из клея. |
Подскажите, если в сферу(форма) диаметром 3мм через отверстие менее 1мм залить цианакрилатный клей, и таким же способом сразу после заполнения добавить в него активатор, произойдёт ли полная полимиризация? Цель: на выходе получить гладкий глянцевый шар. Хочу понять возможна ли полимеризация в практически герметичной сфере где отсутствует воздух и влажность, только с помощью активатора? Спасибо всем кто откликнется и подскажет! |
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| Author: | antabu [ 13 Sep 2022 05:25 ] |
| Post subject: | Re: Нуждаюсь в совете |
Расчётное время полимеризации? Мож, сначала смешать и готовую смесь ввести шприцем? Я думаю, шары делают механическим способом. |
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| Author: | moonshine43 [ 13 Sep 2022 09:55 ] |
| Post subject: | Re: Нуждаюсь в совете |
А чего бы не попробовать? Расходы материалов и времени невелики.. |
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| Author: | vano34 [ 13 Sep 2022 13:49 ] | |||
| Post subject: | Re: Нуждаюсь в совете | |||
Hello, I had a jar of 3,3'-Diaminobenzidine, when I opened it it had black color and ammonia smell, what is the easiest way to make some pure 3,3'-Diaminobenzidine? just the reagent every photo which I saw on the internet had no black color. also, reagent is not soviet made, it's a fluka chemika reagent maybe 10-15 years old.
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| Author: | Volodymyr [ 13 Sep 2022 14:25 ] |
| Post subject: | Re: Нуждаюсь в совете |
Benzidine and its derivatives are easily oxidized in air. The process is irreversible. I think, that in addition to oxidation, condensation reactions take place. |
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| Author: | vano34 [ 13 Sep 2022 14:46 ] | ||
| Post subject: | Re: Нуждаюсь в совете | ||
thank you! I opened it months ago. so I hope only a small amount is oxidized. so I thought if I recrystallized or something, I want to make an organic product(on photo) from this compound and 1,10-phenanthroline-5,6-dione, and finally, I want binuclear ligand, then ill make europium complex. finally molecular will be like that two europium metals, one this compound and six any acetylacetone derivative. the ligand which i made in program:
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| Author: | Volodymyr [ 13 Sep 2022 15:40 ] |
| Post subject: | Re: Нуждаюсь в совете |
Theoretically, recrystallization is possible. But I have not heard that oxidized benzidine being purified in this way. Amino derivatives are oxidized even more easily than benzidine itself. |
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| Author: | vano34 [ 13 Sep 2022 15:44 ] |
| Post subject: | Re: Нуждаюсь в совете |
thanks! anyway ill try with it so let's see the result. |
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| Author: | Volodymyr5 [ 13 Sep 2022 16:09 ] |
| Post subject: | Re: Нуждаюсь в совете |
Such compounds are toxic (carcinogens). Be careful! |
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| Author: | vano34 [ 13 Sep 2022 17:02 ] |
| Post subject: | Re: Нуждаюсь в совете |
yes, sure! thank you! |
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| Author: | newann [ 15 Sep 2022 17:56 ] |
| Post subject: | Re: Нуждаюсь в совете |
moonshine43 wrote: А чего бы не попробовать? Расходы материалов и времени невелики.. Спасибо за ответ! Буду пробовать) |
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| Author: | vano34 [ 16 Sep 2022 13:22 ] |
| Post subject: | Re: Нуждаюсь в совете |
what is the best way to make uranyl nitrate from metallic uranium? I just want a few ml of its solution to make heteropolymetalate, I don't want it as solid salt. |
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| Author: | Volodymyr [ 16 Sep 2022 13:41 ] |
| Post subject: | Re: Нуждаюсь в совете |
The compound is synthesized from UO3 and dilute HNO3. Metallic uranium is a less available raw material, but it can also be used. Attachment:
File comment: Ю.В. Карякин, И.И. Ангелов Чистые химические вещества 1.jpg [ 637.73 KiB | Viewed 3000 times ] viewtopic.php?f=15&t=35&p=1750#p1750 |
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| Author: | vano34 [ 16 Sep 2022 13:49 ] |
| Post subject: | Re: Нуждаюсь в совете |
thank you! I saw the oxide method, but I don't have it. I think nitric acid cant oxidize uranium to (VI), maybe it will produce uranium(IV). I can oxidize (IV) to (VI) with H2O2, but I don't know which tetravalent compound will form. there is no uranium nitrate yes? only uranyl nitrate. maybe it produces UO2? |
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