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Topic: Doubt: Sulfuric acid polarity  (Read 7753 times)

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Offline BloodCrisis

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Doubt: Sulfuric acid polarity
« on: May 05, 2013, 11:41:16 AM »
This is a dumb :-\ problem I have with H2SO4 molecule. But is drivin' me crazy

Deducting the molecular geometry and the AXE method I can realize that the molecule is polar (tetrahedrical, but with different outer atoms), but the question I have is whether the electronic cloud will be more attracted to the <-OH> groups or by the < :rarrow: O> ones.

Another way to put it is if you can predict whether the -O is more or less electronegative than-OH, at least empirically. (we all know that real electronegativity applies only to atoms, not to groups)
The same applies to molecules such as HNO3.

The thing is that I have to create a diagram of the polarity of the molecule for a class that I have to impart. (More especifically i have to diagram H2SO4 and HNO3 dipolar moments)

Thanks in advance!

PD: At least if you can recommend some kind of software to model electrostatic mapping.
« Last Edit: May 05, 2013, 12:19:54 PM by BloodCrisis »

wolf_of_benjamin

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Re: Doubt: Sulfuric acid polarity
« Reply #1 on: May 09, 2013, 05:56:03 AM »
One thing I know about concentrated sulfuric acid is that in Organic Chemistry, especially in Biochemistry; it will disintegrate the H and O molecules in organic substances into H2O to attain equilibrium; reducing its concentration. At the end of the process, virtually only solid Carbon is left.

Offline Arkcon

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Re: Doubt: Sulfuric acid polarity
« Reply #2 on: May 09, 2013, 06:39:20 AM »
One thing I know about concentrated sulfuric acid is that in Organic Chemistry, especially in Biochemistry; it will disintegrate the H and O molecules in organic substances into H2O to attain equilibrium; reducing its concentration. At the end of the process, virtually only solid Carbon is left.

Does this bit of trivia actually answer the topic at hand?
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wolf_of_benjamin

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Re: Doubt: Sulfuric acid polarity
« Reply #3 on: May 10, 2013, 04:10:25 AM »
The polarity of Sulfuric acid is disputed in terms of it's viscosity. We all know that Sulfuric acid exists in two forms: concentrated and diluted.

Here is am example of why Sulfuric acid is complex:

H2SO4 + 2H2O <=> HSO4(-) + OH(-) + H3O(+) <=> SO4(2-) + H2O + H3O(+)

It depends on the amount of water it contains.

By the way Sulfuric acid will dissolve almost anything except Carbon.


Edited out by Moderator
« Last Edit: May 10, 2013, 02:20:33 PM by billnotgatez »

Offline Borek

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Re: Doubt: Sulfuric acid polarity
« Reply #4 on: May 10, 2013, 04:41:11 AM »
We all know that Sulfuric acid exists in two forms: concentrated and diluted.

What about semiconcentrated and semidiluted? Or semisemidiluted? Yes, some p[roperties depend on the concentration, but classifying acid as either concentrated or diluted is like classifying people into high and small, forgetting they they come in any height between two extremes.

Quote
Here is am example of why Sulfuric acid is complex:

H2SO4 + 2H2O <=> HSO4(-) + OH(-) + H3O(+) <=> SO4(2-) + H2O + H3O(+)

Sorry, it is an unbalanced nonsense. Not even wrong.

Quote
By the way Sulfuric acid will dissolve almost anything except Carbon.

And except all other things it will not dissolve, including noble metals, sand, most rocks, and so on.

Please stop posting about things you have no idea about.
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Offline opsomath

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Re: Doubt: Sulfuric acid polarity
« Reply #5 on: May 10, 2013, 09:30:03 AM »
It looks like its dipole moment is something like 2.6-2.7 Debye, which is very large.

http://kb.osu.edu/dspace/bitstream/handle/1811/31402/Slide14.GIF?sequence=10

In practice, it is immensely polar.

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