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Sciencemadness Discussion Board » Fundamentals » Chemistry in General » One of my favorite element

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vano

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posted on 29-12-2020 at 03:24

One of my favorite element

One of my favorite element is selenium. Is one of the element I come in contact with most often. I mainly make selenous acid from this selenium for metal bluing. But I also make all sorts of compounds. Unfortunately I do not have all of them with me and I can not take photos. I will be grateful if anyone can give me a good chemical reaction. I would be happy to add it to my collection.

valeg96

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posted on 29-12-2020 at 04:06

Can't wait for the Georgian courier service to be back working...

Bedlasky

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posted on 29-12-2020 at 08:36

Nice. CdSe is described as red, but yours looks brown. How did you make it?

vano

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posted on 29-12-2020 at 08:49

Quote: Originally posted by Bedlasky

Nice. CdSe is described as red, but yours looks brown. How did you make it?

Actually it is a mixture of different selenides. I made it from cadmium sulfate monohydrate and sodium polyselenide. I wrote it before:
http://www.sciencemadness.org/talk/viewthread.php?tid=156684

I do not think that cadmium can form a polyselenide s where there will be a lot of selenium in the chain, presumably it must be mostly monoselenide. Red will not be because the salts in the water were dissolved and (poly?)selenode precipitated instantly, while red is when the organic solvent dissolves selenium and cadmium oxide, i.e. smaller particles, while it is much larger. I also made it with sodium selenide and had a slightly lighter color on it. It was not too red. I have already used them all as a pigment.