🚀 go-pugleaf

Klemens Raithel wrote:
> 
> I was wondering, if there exists a dependency between the maximum
> saturation of a gas (oxygen) and the viscosity of the solution caused by
> a high concentrated cosolvent (e.g. sucrose, 3M).
> 
> Is there something known about this problem in the world of science?

It's hard to see how thermodynamics depends on viscosity rather than
concentration and identity of the solute.  A very small concentration
of high MW polyacrylamide will give you a very viscous aqueous
solution.  It's still mostly water.

-- 
Uncle Al
http://www.mazepath.com/uncleal/
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 (Toxic URLs! Unsafe for children and most mammals)
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Uncle Al wrote:

> Klemens Raithel wrote:
> >
> > I was wondering, if there exists a dependency between the maximum
> > saturation of a gas (oxygen) and the viscosity of the solution caused by
> > a high concentrated cosolvent (e.g. sucrose, 3M).
> >
> > Is there something known about this problem in the world of science?
>
> It's hard to see how thermodynamics depends on viscosity rather than
> concentration and identity of the solute.  A very small concentration
> of high MW polyacrylamide will give you a very viscous aqueous
> solution.  It's still mostly water.

Hi Uncle Al,

I am not searching for a viscous solution mostly consisting of water.
I am trying to find a relationship between different viscous solutions and
their capacity to solve gas (to the maximum saturation).
Does a physical formula or chemical rule exist for THIS problem???
Thanks,

Klemens Raithel

It is my understanding that a solution can theoretically dissolve the same
amount of gas regardless of viscosity (if that is the only variable).

However, as can be learnt from vulcanology, viscosity may affect the
apparent solubility. Granitic, or high silica magmas are very viscous, and
have a much higher gas content (4-6%) than basaltic magmas which are lower
in silica (~1% gas).

This is due largely to the viscosity, and the fact that the viscous magmas
do not release the gas nearly as readily.

I would assume that the opposite effect can also be noticed, in that gases
will dissolve slower in a viscous solution, possibly to the extent that the
same concentration may not be reached in a practical time frame.

Cheers,
Mitchell


"Klemens Raithel" <klemens@biophysik.biologie.uni-mainz.de> wrote in message
news:38F498A7.B43FBAD5@biophysik.biologie.uni-mainz.de...
>
>
> Uncle Al wrote:
>
> > Klemens Raithel wrote:
> > >
> > > I was wondering, if there exists a dependency between the maximum
> > > saturation of a gas (oxygen) and the viscosity of the solution caused
by
> > > a high concentrated cosolvent (e.g. sucrose, 3M).
> > >
> > > Is there something known about this problem in the world of science?
> >
> > It's hard to see how thermodynamics depends on viscosity rather than
> > concentration and identity of the solute.  A very small concentration
> > of high MW polyacrylamide will give you a very viscous aqueous
> > solution.  It's still mostly water.
>
> Hi Uncle Al,
>
> I am not searching for a viscous solution mostly consisting of water.
> I am trying to find a relationship between different viscous solutions and
> their capacity to solve gas (to the maximum saturation).
> Does a physical formula or chemical rule exist for THIS problem???
> Thanks,
>
> Klemens Raithel
>

Fowarded message from Wolfgang Schechinger

----- Original Message -----
From: "Wolfgang Schechinger" <Wolfgang.Schechinger@med.uni-tuebingen.de>
To: "Mitchell Isaacs" <misaacs@student.usyd.edu.au>
Sent: Thursday, 13 April 2000 10:03
Subject: Re: Searching for a dependency of the maximum gas saturation in


> Given an unlimited amount of time (means we are looking at
> thermodynamic, not kinetical properties):
>
> 1) I would look at the gas like it was a undissociated chemical, e.g.
> glucose.
>
> 2) If the amount of substance causing the viscosity is vanishingly
> low, the solubility of the gas actually should not be different.
>
> 3) If there is a significant amount of substance causing the
> viscosity (say 5%) and this substance is inert, I would assume the
> solubility as much as 95% of the solvent's capacity. Since there is
> 95% of the solvent in this case. Best would be considering molarities
> in this case.
>
> 4) However, if the substance is changing the solvent's structure,
> the solute is intercalating or there is sme kind of a chemical
> reaction (like iodine in starch containing solutions or if KI is
> present),  the solubility of the gas would be totally different and
> only a complex model (or practical measurements) would make a good
> approach
>
> Just some ideas,
>
> Wolfgang
>
>
> > It is my understanding that a solution can theoretically dissolve
> > the same amount of gas regardless of viscosity (if that is the only
> > variable).
> >
> > However, as can be learnt from vulcanology, viscosity may affect the
> > apparent solubility. Granitic, or high silica magmas are very
> > viscous, and have a much higher gas content (4-6%) than basaltic
> > magmas which are lower in silica (~1% gas).
> >
> > This is due largely to the viscosity, and the fact that the viscous
> > magmas do not release the gas nearly as readily.
> >
> > I would assume that the opposite effect can also be noticed, in that
> > gases will dissolve slower in a viscous solution, possibly to the
> > extent that the same concentration may not be reached in a practical
> > time frame.
> >
> > Cheers,
> > Mitchell
> >
> >
> > "Klemens Raithel" <klemens@biophysik.biologie.uni-mainz.de> wrote in
> > message news:38F498A7.B43FBAD5@biophysik.biologie.uni-mainz.de... >
> > > > Uncle Al wrote: > > > Klemens Raithel wrote: > > > > > > I was
> > wondering, if there exists a dependency between the maximum > > >
> > saturation of a gas (oxygen) and the viscosity of the solution
> > caused by > > > a high concentrated cosolvent (e.g. sucrose, 3M). >
> > > > > > > Is there something known about this problem in the world
> > of science? > > > > It's hard to see how thermodynamics depends on
> > viscosity rather than > > concentration and identity of the solute.
> > A very small concentration > > of high MW polyacrylamide will give
> > you a very viscous aqueous > > solution.  It's still mostly water. >
> > > Hi Uncle Al, > > I am not searching for a viscous solution mostly
> > consisting of water. > I am trying to find a relationship between
> > different viscous solutions and > their capacity to solve gas (to
> > the maximum saturation). > Does a physical formula or chemical rule
> > exist for THIS problem??? > Thanks, > > Klemens Raithel >
> >
> >
> -----
> This message is encrypted. Use your brain to decode it.
> -----
> Dr. Wolfgang Schechinger, Dept. of Pathobiochemistry
> University of Tuebingen, Germany
> email: wolfgang.schechinger@med.uni-tuebingen.de
> wwWait: http://www.medizin.uni-tuebingen.de/~wgschech/start.htm
> -----
> usual disclaimers apply
> -----