vano
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Mercury pyroantimonate challenge
Hi. I have read some things about this compound, sometimes described as red mercury, since no one knows what it really was while this compound has a
red color like iodide and oxide. I do not believe it is red mercury, but I wonder how it is made. I have not found ways of its synthesis anywhere on
the internet, however it is interesting that it decomposes at high temperatures, unlike other compounds of mercury.
Some info:
Formula - Hg2Sb2O7
Molecular weight -756 u
Melting point - 700°C
Density - 9.5-10.5 T / cubic meter
Also called oxystybate.
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Maurice-VD-3
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The formula Hg2Sb2O7 is a 1:1 mixture of HgO + Hg(SbO3)2. And it can be made by mixing solutions of HgCl2 and potassium antimonate KSb(OH)6·(1/2)H2O,
which can also be written KSbO3·(7/2)H2O. This product is commercial.
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vano
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Quote: Originally posted by Maurice-VD-3  | | The formula Hg2Sb2O7 is a 1:1 mixture of HgO + Hg(SbO3)2. And it can be made by mixing solutions of HgCl2 and potassium antimonate KSb(OH)6·(1/2)H2O,
which can also be written KSbO3·(7/2)H2O. This product is commercial. |
Thanks. Where did you read about that?
[Edited on 6-3-2021 by vano]
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Bedlasky
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It is logical pathway - precipitation by mixing of solutions of soluble antimonate and soluble mercury salt. Btw. I think that correct formula for
this compound is Hg[Sb(OH)6]2, because in solution antimonate exist as [Sb(OH)6]-.
| Quote: Originally posted by vano | | I have not found ways of its synthesis anywhere on the internet, however it is interesting that it decomposes at high temperatures, unlike other
compounds of mercury. |
I don't think that heating any mercury salt is smart idea.
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vano
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| Quote: Originally posted by Bedlasky | It is logical pathway - precipitation by mixing of solutions of soluble antimonate and soluble mercury salt. Btw. I think that correct formula for
this compound is Hg[Sb(OH)6]2, because in solution antimonate exist as [Sb(OH)6]-.
| Quote: Originally posted by vano | | I have not found ways of its synthesis anywhere on the internet, however it is interesting that it decomposes at high temperatures, unlike other
compounds of mercury. |
I don't think that heating any mercury salt is smart idea. |
This compound doesn't decompose. Also formula is different. Look at.
https://www.sciencedirect.com/science/article/abs/pii/S09258...
https://ru.wikipedia.org/wiki/%D0%9E%D0%BA%D1%81%D0%B8%D1%81...
(Use Google translate)
[Edited on 6-3-2021 by vano]
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Bedlasky
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But this Hg2Sb2O7 is prepared in solid state. Resulting compound can be quite different than one obtained from aqueous solution. Na[Sb(OH)6] was
considered to be Na2H2Sb2O7.5H2O - this can be precipitated from aqueous K[Sb(OH)6] and Na+ salt.
[Edited on 6-3-2021 by Bedlasky]
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S.C. Wack
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Yes its the red mercury.
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