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Natural Science Forum / Earth Science / Oceanography / August 2003



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Alex Truman - 29 Jul 2003 18:18 GMT
Hi, I have a research project on water desalinization and I need a few
formulas.

1) What is the formula(s) to determine the boiling point of water at a
given pressure and with a given amount of dissolved salt (NaCl) ?

2) What is the concentration of NaCl in seawater?  I've looked on the
net but haven't had any success in finding accurate data.

3) How do the concentration of salt in water and the atmospheric
pressure on the water affect the latent heat of vaporization of water?
If I lower the pressure to say 0.1 atm, will that significantly lower
the latent heat of vaporization of water?

Any help you can give, even if it's only to point me in right
direction, would be greatly appreciated!

Alex
Repeating Decimal - 29 Jul 2003 19:03 GMT
> Hi, I have a research project on water desalinization and I need a few
> formulas.
[quoted text clipped - 14 lines]
>
> Alex
These are all things that are easy to find in a library of any merit.

1.  Look in a BOOK on physical chemistry.

2.  Look in a BOOK on oceanography.

3.  USE your brain. If that fails, look in a BOOK on physical chemistry.

Bill
Chris - 30 Jul 2003 05:13 GMT
>1.  Look in a BOOK on physical chemistry.
>
>2.  Look in a BOOK on oceanography.
>
>3.  USE your brain. If that fails, look in a BOOK on physical chemistry.

I don't see how flipping through the pages of a book to find a formula helps
this person learn about his topic any more than asking for the formula on this
newsgroup.  It's not as if either requires any thinking, the formula already
exists.  One just seems more time efficient than the other.
Marvin Margoshes - 29 Jul 2003 19:16 GMT
> Hi, I have a research project on water desalinization and I need a few
> formulas.
[quoted text clipped - 14 lines]
>
> Alex

Is the reason for the project that you learn about desalinazation, or that
you learn how to find information?
Ian St. John - 30 Jul 2003 01:47 GMT
> > Hi, I have a research project on water desalinization and I need a few
> > formulas.
[quoted text clipped - 17 lines]
> Is the reason for the project that you learn about desalinazation, or that
> you learn how to find information?

This is some high school kid with his homework isn't it...?

1: http://www.sci-journal.org/vol3no2/v3n2a2.html

2: Salt varies quite a bit over the oceans from the dense mediteranian to
the relatively fresh equator ( lots of fresh water input from rivers ). It
also varies with depth.
http://icp.giss.nasa.gov/research/oceans/oceanchars/salinity.html

3: The latent heat of vaporization is a fixed constant dependent on the
molecule. It does not change with salinity. Anyone with a high school
diploma should know that so the 'research' claim is dubious.
George - 30 Jul 2003 07:27 GMT
> Hi, I have a research project on water desalinization and I need a few
> formulas.
[quoted text clipped - 4 lines]
> 2) What is the concentration of NaCl in seawater?  I've looked on the
> net but haven't had any success in finding accurate data.

http://www.usc.edu/org/seagrant/IELessons/Unit1/Lesson5/teachertable.html

> 3) How do the concentration of salt in water and the atmospheric
> pressure on the water affect the latent heat of vaporization of water?
[quoted text clipped - 5 lines]
>
> Alex
George - 30 Jul 2003 07:28 GMT
> Hi, I have a research project on water desalinization and I need a few
> formulas.
[quoted text clipped - 4 lines]
> 2) What is the concentration of NaCl in seawater?  I've looked on the
> net but haven't had any success in finding accurate data.

Also check ou this site:

http://www.sfos.uaf.edu/msl111/notes/chem.html

> 3) How do the concentration of salt in water and the atmospheric
> pressure on the water affect the latent heat of vaporization of water?
[quoted text clipped - 5 lines]
>
> Alex
Martin H. Booda - 06 Aug 2003 01:04 GMT
>Hi, I have a research project on water desalinization and I need a few
>formulas.

I'd stick with breast milk.  It contains DHA, unlike formulas.

>1) What is the formula(s) to determine the boiling point of water at a
>given pressure and with a given amount of dissolved salt (NaCl) ?

It is a common misconception that water "boils".  Actually, it passes
from a partially transparent state to a fully transparent state.  The
Amazing Randy has used this principle of physics to debunk some of the
more popular "magic" tricks, such as the "disappearance" of the Statue
of Liberty (it was done on a rainy day when the statue was covered with
rainwater).  Even Ben Franklin, who said "a watched pot never boils",
knew this fact.  The only thing that gives water any opaqueness at all
is the biota within it.  When salt is added, this kills off all the
life forms in the water (ever seen what it can do to a slug?) and makes
the water turn transparent faster.  The rate at which x pounds of salt
added to u gallons of water causes this to happen can be determined by
a series of eigenfunctions f(u) sub n, which equate to the integral of
e to the x power:

/ x
\e  = f(u)
/         n

>2) What is the concentration of NaCl in seawater?  I've looked on the
>net but haven't had any success in finding accurate data.

The National Council on Liquids (NaCl) has received government grants
for many years to concentrate their work on seawater.  No one knows why.

>3) How do the concentration of salt in water and the atmospheric
>pressure on the water affect the latent heat of vaporization of water?

Very slowly.  A coloscope is often required to observe the process.

> If I lower the pressure to say 0.1 atm, will that significantly lower
>the latent heat of vaporization of water?

Many attempts have been made to lower the atmospheric pressure to 0.1
atm.  Should anybody ever be successful at doing this, the latent heat
of vaporization of water will be the least of our problems.

>Any help you can give, even if it's only to point me in right
>direction, would be greatly appreciated!

Any time, droogie!

>Alex

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