CCL:Answer to my question on osmotic pressure
On Jan 31, 8:05pm, Eric Sribnick wrote:
> Subject: CCL:Answer to my question on osmotic pressure
> Thanks to everyone who wrote me. This answer is indicative of the kind
> that I have been receiving (i.e. Nobody as of yet has told me that the
> solution would not come out of the tube).
>
> ---------- Forwarded message ----------
> Date: Tue, 31 Jan 1995 18:51:05 -0600 (CST)
> From:PEARLMAN(-(at)-)VAX.PHR.UTEXAS.EDU
> To: heysrib(-(at)-)cs1.presby.edu
> Subject: A question on osmotic pressure
>
> Hi --
>
> > If the tube part was cut down lower than the point where osmotic
> > pressure pushes the water up to, would water come out of the end
> > of the tube?
>
> YES!! I've done this as a demonstration on several occasions. You
> can actually get the solution to "shoot" out of the end of tube!
> Of course, if you allow the solution to fall back into the beaker,
> then the process grinds to a halt fairly quickly (as the concentrations
> on both sides of the membrane become almost equal). But if you direct
> the flow from the tube away from the beaker and lower the thistle tube
> as necessary, you can almost empty the beaker.
>
> Have fun.
>
> -- Bob Pearlman
>
NOT ALWAYS YES!: the surface tension at the end of the tube may resist waters
to spill over.
--
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Dr. Nick Blom Tel : +1-514-3436111 ext 5352
Departement de Biochimie Fax : +1-514-3432210
Universite de Montreal Email: nick(-(at)-)bch.umontreal.ca
C.P. 6128, Station Centre-Ville
Montreal, PQ, H3C 3J7
Canada
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