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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Tuesday, December 20, 2011

Superacids

What do you think if you hear PURE hydrochloric acid? It's too dangerous, too acid, etc. Yes you're right. Now, what do you think if you hear Pure Sulfuric Acid? Dangerous than HCl and very exothermic.

Now let me ask you, could you calculate the pH of 2 M HCl? You won't answer my question with -0,693, will you?

No. Sorensen just makes the pH range between 0 until 14. We can calculate pH of solution more than 1 M so that we call that solution as a concentrated solution. And the bad news is, this calculation only works for Arrhenius Acid.

Okay, we will enter to our topic now.
There are several liquids which have a really real acidic property, there is about 106 – 1010 times bigger than nitric and sulfuric acid. We call this acid as Superacids. To calculate the acidic level of this acid, of course we won't use Sorensen Formula, we will use another formula called Hammet Acidic Function.



With
B = Base Indicator
BH+ = Conjugated Acid of Base

We can say this formula as the expanded pH scale under pH = 0. With this formula, we can calculate the acidic level of pure sulfuric acid is -12, 1012 times bigger than 1M Sulfuric Acid.

Until now, the strongest superacid fount is the magic acid which is the 1:1 molar mixture of HSO3F and SbF5. This solution has the acidic level of Ho = -19,4. In experiments, superacids can be used to "proton-ing" molecules which is not a usual base. See the picture below:


Here is a question for you (Preparatory Problems of IChO 2012):



Further Reading . . .
Wikipedia
Cotton and Wilkinson. 2009. Inorganic Chemistry.
Preparatory Problems of IChO 2012


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