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Author Topic: Is sulphuric acid stronger than sulphurous acid?  (Read 5214 times)

Erik Hughes

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Is sulphuric acid stronger than sulphurous acid?
« on: 05/05/2010 09:30:03 »
Erik Hughes  asked the Naked Scientists:
   
Hey Chris,

I've looked everywhere and I can't find a simple explanation to this problem.

Which acid is stronger, sulphuric acid (H2SO4) or sulphurous acid (H2SO3)?

I think its the Sulphuric acid but I'm not entirely sure.

Any help would be greatly appreciated.
Kind Regards,

Erik :D

What do you think?
« Last Edit: 05/05/2010 09:30:03 by _system »


 

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Is sulphuric acid stronger than sulphurous acid?
« Reply #1 on: 05/05/2010 11:33:02 »
The answer is yes. H2SO4 is a very strong acid, it has an acidity constant much higher than 1 (it's very difficult to measure it in water because it's almost totally dissociated in its first dissociation) while H2SO3 is a weak acid, with acidity constant = 1.4*10-2.

Just think that the associated base of H2SO4, that is the ion HSO4-, is practically as acid as H2SO3 (Ka = 1*10-2)...
 

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Is sulphuric acid stronger than sulphurous acid?
« Reply #1 on: 05/05/2010 11:33:02 »

 

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