ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: kenhung123 on August 22, 2010, 11:31:23 am

Title: Does this exist?
Post by: kenhung123 on August 22, 2010, 11:31:23 am
SO2+H2SO4=>H2S2O6
Apparently this is a dehydration reaction? (Yes SO2 is intentional not SO3)
Title: Re: Does this exist?
Post by: golden on August 22, 2010, 12:17:32 pm
According to this Powerpoint it exists:
http://srnl.doe.gov/hse_workshop/Gruet%20Electrolyzer%20Performance.pdf

(Page 12).

It shows it like: H2S2O6 -> SO2 + H2SO4
Title: Re: Does this exist?
Post by: kenhung123 on August 22, 2010, 12:25:58 pm
Hmm interesting I thought the question had an error. So how is the dehydration?
Title: Re: Does this exist?
Post by: golden on August 22, 2010, 12:42:40 pm
Are you referring to the dehydration reaction with sulfuric acid?
Title: Re: Does this exist?
Post by: kenhung123 on August 22, 2010, 01:20:34 pm
The above equation, how is it dehydration?
Title: Re: Does this exist?
Post by: pooshwaltzer on August 22, 2010, 02:45:49 pm
Quote from: kenhung123 on August 22, 2010, 01:20:34 pm
The above equation, how is it dehydration?

Aqueous reactants becoming solid product
Title: Re: Does this exist?
Post by: cypriottiger on August 22, 2010, 04:25:44 pm
Quote from: pooshwaltzer on August 22, 2010, 02:45:49 pm
Quote from: kenhung123 on August 22, 2010, 01:20:34 pm
The above equation, how is it dehydration?

Aqueous reactants becoming solid product

+1
and no water is being produced
Title: Re: Does this exist?
Post by: Mao on August 22, 2010, 07:36:41 pm
I'm not sure that constitutes dehydration. The label hydration and dehydration are regardless of solvent.

I think it's to do with the number of waters inside the molecule. It is known that SO3 + H2O -> H2SO4, which is a hydration reaction (hydration of SO3), and the S in H2SO4 can be thought of as possessing one 'water'. In addition of SO2, the S in H2S2O6 no longer has a whole water, as it will be shared between two S atoms, thus the degree of hydration is lower.

But then, this labeling of organic reactions is rather.. unnecessary.
Title: Re: Does this exist?
Post by: kenhung123 on August 22, 2010, 09:50:24 pm
Thanks all for the clairification