[PLUG-TALK] Chemistry help needed

[Keith Lofstrom]

On Mon, Jul 23, 2012 at 06:48:26PM -0700, John Jason Jordan wrote:
> All the information that I once had about chemistry has left the
> premises. 
> 
> I need to make a 2.25% brine. Basically this is nothing more than
> dihydogen monoxide with sodium chloride in solution. The problem is
> what quantity of salt (by weight) to what quantity of water (by
> volume). You would think Mr. Google could deliver this information,

I think the first question is, who is telling you to make a 2.25%
brine, for what purpose?  They may mean "salinity", which is the
weight of salt divided by the weight of the pure water it is added
to.

A convenient factoid is that the "salinity" of seawater is 3.5%,
or 35 grams of salt per liter of water (pure water is about 1000
grams per liter).  If "they" mean a brine of 2.25% salinity, 
then they are asking for 22.5 grams of salt per liter, or
1 pound of salt per 5.326 gallons.  

Of course, they could mean complex oceanlike brine, which is 
more complex than than just salt.  In that case, go to the
beach, get 10 gallons of salt water upcurrent from any stream
or sewer outflow,  bring it home, and mix in about 3.6 gallons
of fresh water.  That costs more than tap water and salt, but 
you get a trip to the beach out of it.

( I've been reading too many oceanography books lately ).

Keith

-- 
Keith Lofstrom          keithl at keithl.com         Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs