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Author: Subject: I found that elemental boron is inert to this aggressive chemical bulldozer
fusso
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shocked.gif posted on 18-6-2019 at 14:11
I found that elemental boron is inert to this aggressive chemical bulldozer


tldr: piranha solution.
I wanted to remove the filter paper from the boron powder.
Some B is stuck on the paper. Time for some fun.
To my surprise the solution didn't dissolve the B. Just the paper.

[Edited on 190619 by fusso]




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Tsjerk
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[*] posted on 18-6-2019 at 16:02


You would think that someone with over 1400 posts would know a post with no references and with trivial knowledge, especially one with a clickbait title, belongs in beginnings.
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mayko
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[*] posted on 18-6-2019 at 17:00


"aggressive bulldozer"



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CharlieA
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[*] posted on 18-6-2019 at 17:09


Quote: Originally posted by Tsjerk  
You would think that someone with over 1400 posts would know a post with no references and with trivial knowledge, especially one with a clickbait title, belongs in beginnings.


You might think that, but you would apparently be wrong.:D
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SWIM
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[*] posted on 18-6-2019 at 18:32


I thought he meant this

31fTDn5KvTL.jpg - 11kB




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Keras
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[*] posted on 18-6-2019 at 21:48


Quote: Originally posted by SWIM  
I thought he meant this


Cripes. I remember reading Van Vogt's The World of Ā in that edition.

Anyways, that's good to know boron survives piranha solution. I guess elemental boron is more expensive than filter paper, am I right? :p
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j_sum1
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19-6-2019 at 00:19
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[*] posted on 19-6-2019 at 00:28


Well, I did not know that, but I am certainly not surprised.
I know that B is impervious to acids in general and I would be surprised if it oxidised easily, so I guess it all makes sense.

Boron chemistry is not a particularly popular field and many boron compounds are relatively unuseful. (Probably those two statements are correlated.) I certainly have minimal experience except for preparing elemental boron. It is good to add bits to the knowledge bank.

But, yeah, this does belong in Beginnings.

Fusso, do keep working on the Boron and tell us anything interesting you find. It is a neglected element. Even if some information is only a quick Google search away, it is nice to have discussion to raise awareness.




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Sulaiman
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[*] posted on 19-6-2019 at 04:05
According to the Boron page on Wikipedia ...


The chemical behavior of boron resembles that of silicon more than aluminium. Crystalline boron is chemically inert and resistant to attack by boiling hydrofluoric or hydrochloric acid. When finely divided, it is attacked slowly by hot concentrated hydrogen peroxide, hot concentrated nitric acid, hot sulfuric acid or hot mixture of sulfuric and chromic acids



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fusso
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[*] posted on 19-6-2019 at 07:25


What actually surprises me is boron resists oxidation by hot piranha, not H2O2 or H2SO4 individually. And I'm referring to the amorphous(?) form which is extracted from Nd magnets.



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Tsjerk
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[*] posted on 19-6-2019 at 07:58


I guess given enough time boron is not inert to piranha.
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[*] posted on 19-6-2019 at 13:39


Quote: Originally posted by mayko  
"aggressive bulldozer"


wtf did i just watch?
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[*] posted on 23-6-2019 at 04:25


Quote: Originally posted by lordcookies24  
Quote: Originally posted by mayko  
"aggressive bulldozer"


wtf did i just watch?


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[*] posted on 4-9-2019 at 09:35


Well, boron oxide is quite resistant to most acids, especially the oxidizing variety, so I assume there's a thin protective oxide layer forming on the surface of the boron that protects the element.



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[*] posted on 5-9-2019 at 05:49


Boron oxide is quite inert in terms of redox reactions, but it is not inert in terms of reactions where its oxidation state does not change. It is quite hygroscopic and dissolves in water, producing even some heat. B2O3 reacts to form H3BO3 by absorbing water. It also reacts very easily with alcohols, producing esters. E.g. with methanol it produces a trimethyl ester, B(OCH3)3, quickly and nearly quantitatively.
Elemental boron indeed has some similarity with elemental silicon, but the oxides of the two elements behave quite differently.





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