Questions tagged [boron-family]
For questions about the elements of the boron family (group 13), their compounds, and their physical and chemical properties.
38
questions
0
votes
0
answers
43
views
Mass of boron in boric acid
I have recently submitted a slime activator product for EN71-3 UK toy safety testing. The test aims to measure the amount of boron that is able to migrate from the toy if it is consumed by a child in ...
- 27
0
votes
2
answers
83
views
Why does boron have higher affinity for fluorine than oxygen?
$\ce{F-}$ can displace $\ce{OH}$ in $\ce{B(OH)3}$ and form $\ce{BF3}$. $\ce{BF3}$ is stable due to resonance, but donation of oxygen should be stronger, as -I power of fluorine dominates its lone pair ...
- 161
15
votes
3
answers
2k
views
If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?
Many metal diboride compounds like $\ce{MgB2}$, $\ce{TiB2}$, and $\ce{ReB2}$ have laminated crystal structures with alternating sheets of metal atoms and boron atoms. If we polish the surface to ...
- 571
0
votes
0
answers
633
views
Please explain the order of Lewis acidic strength in trichlorides of boron group
The order of decreasing Lewis acid character as per online sources is as follows:
BCl3 > AlCl3 > GaCl3 > InCl3
Reason cited is: As we move down the group, the size of atom increases, and as a ...
- 9
2
votes
1
answer
330
views
What is the correct method for converting a concentration given in ppm to molarity?
I need to convert a concentration of dissolved boric acid $(\ce{H_3BO_3})$ in water (at high temperature and pressure) from ppm to mol/L.
Concentration of boric acid: $c_{ppm}=1500\ \ce{ppm}$
Molar ...
- 137
-4
votes
1
answer
355
views
Bonding in boron icosahedra [closed]
How do boron atoms make five bonds with other boron atoms even if the electron configuration of unbound boron atoms is [He]2s²2p¹, i.e. there is an insufficient number of outer electrons? Are the ...
- 127
0
votes
1
answer
43
views
Inhibitors of hydration
Superglue (Cyanoacrylate) polymerizes via hydration, and using an activator such as a borax solution speeds up that process. I need to mix these 2 without them reacting. (Or at least not noticeably.)
...
- 155
2
votes
2
answers
634
views
Does boron exhibit +1 oxidation state?
My teacher told that boron exhibits only a $+3$ oxidation state, but he also wrote the unbalanced reaction
$$\ce{B + C -> B4C}.$$
Carbon has greater electronegativity than boron leaving us with $\...
- 41
3
votes
0
answers
174
views
How to decide whether diborane undergoes symmetric or asymmetric cleavage?
How does one decide whether diborane undergoes symmetric or asymmetric cleavage, given the lewis base which attacks it. Is it possible to ascertain this theoretically?
Sterics is mentioned as the ...
- 1,409
0
votes
1
answer
464
views
What can happen to overheated aluminum cookware?
I accidentally overheated an aluminum espresso maker, to around 250-300° C in my estimation, but it might be even higher - I didn't measure, though. After research, I found that the material used is ...
1
vote
1
answer
1k
views
Why do boron salts impart a characteristic green colour to the flame
In salts of boron it exists as a cation in the B(III) form. It is known to impart green colour in several of its salts like borates, boron triflourides, boric acid etc. If there are no electrons in ...
- 1,409
1
vote
0
answers
281
views
Heating effect on Orthoboric Acid
I am a high school student and was studying about the effects of heating orthoboric acid, and I saw two textbooks putting different statements.
One book says,
On heating above 370K, orthoboric acid ...
- 556
-1
votes
2
answers
687
views
Why does boron form only covalent compounds? [duplicate]
I got two options,
The size of $\ce{B^3+}$ ions, is very small and the ion has high charge density. Thus, following Fajan's rule, boron forms covalent compounds.
The sum of the first three ionisation ...
- 556
1
vote
1
answer
102
views
Does adding NH3 to an HCl solution facilitate the dissolution of aluminum compounds?
If we compare the two solutions hereafter, which one would better leach/dissolve aluminum metal/compounds present at/near the inner surface of the glass:
Solution A: $10\,\%\, \ce{HCl + H2O}$
Solution ...
- 1,097
0
votes
0
answers
69
views
Reactivity of boron nitride BN, reaction with Cl2
lately I've been interested in chemistry of boron and it's properties.. and I am looking for more information. For example I can't really seem to find lot of information about boron nitride BN other ...
