Sciencemadness Discussion Board
Not logged in [Login ]
Search the forums Search   Frequently Asked Questions FAQ   View member list Member List   Today's Posts Today's Posts   Forum Stats Stats Back to: sciencemadness.org
Sciencemadness Discussion Board » Fundamentals » Chemistry in General » Superacid chemistry Go To Bottom

Printable Version  
Author: Subject: Superacid chemistry
Bedlasky
International Hazard
*****



Posts: 1219
Registered: 15-4-2019
Location: Period 5, group 6
Member Is Offline

Mood: Volatile

[*] posted on 19-12-2020 at 13:21
Superacid chemistry

Hi.

I decided to start topic about superacids. There are probably not much people, which have experience with superacids, but this is quite interesting part of chemistry.

I plan to try make weakly superacidic systems, which everyone can make in home - 96% H2SO4/PO3-/B2O3 and 96% H2SO4/P4O10/B2O3. Metaphosphate can you make by dehydrating dihydrogenphosphate, boric oxide by dehydrating boric acid. Because I have access to spectrophotometer, I will try to measure absorbance of these mixtures using nitrobenzene as indicator and calculate Hammett acidity function. I will post there later my results.

I came across this video about fluoroantimonic acid today:

https://www.youtube.com/watch?v=UWBNcMyfiGQ

Very interesting is reaction between isopentane, benzene, fluoroantimonic acid and potassium permanganate. Isopentane is dissolved by fluoroantimonic acid to form carbocation:

2HF + SbF5 <--> H2F+ + [SbF6]-

[SbF6]- + SbF5 <--> [Sb2F11]-

C5H12 + H2F+ <--> C5H13+ + HF

C5H13+ undergo electrophylic aromatic substition with benzene:

C6H6 + C5H13+ + HF <--> C6H5C5H11 + H2 + H2F+

Isopentylbenzene than reacts with aqueous potassium permanganate to form benzoic acid:

7C6H5C5H11 + 30MnO4- + 30H3O+ --> 11 C6H5COOH + 30MnO2 + 68H2O

Here is link to very interesting document about superacids and measuring H0:

https://macsphere.mcmaster.ca/bitstream/11375/19972/1/Peel_T...



View user's profile View All Posts By User
DraconicAcid
International Hazard
*****



Posts: 4278
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline

Mood: Semi-victorious.

[*] posted on 19-12-2020 at 14:51


I used to work with triflic aid. Unpleasant stuff.



Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
View user's profile View All Posts By User
Fulmen
International Hazard
*****



Posts: 1693
Registered: 24-9-2005
Member Is Offline

Mood: Bored

[*] posted on 19-12-2020 at 15:08


I have worked with oleum, seeing it vaporize paper on contact was enough for me. Check please.



We're not banging rocks together here. We know how to put a man back together.
View user's profile View All Posts By User

 Sciencemadness Discussion Board » Fundamentals » Chemistry in General » Superacid chemistry   Go To Top