Anything that is mixed with water and does not precipitate out must be either 
dissolved
or a stable colloid.  Colloids can generally be detected by Tyndall effect, and 
the ions
are not colloid.  I think another definition is that colloids can be removed via
centrafuge, whereas dissolved substances cannot.  Once again, I believe that 
the ions
meet the definition for being dissolved.

His comment that an atom is an atom has no bearing, we are not talking about an 
atom, but
an ion.  For instance, common salt breaks down into a sodium ion and a chlorine 
ion when
it is dissolved in water.

Marshall

Trem wrote:

> Hi List,
>
> Something has been bothering me for some time and recently I got into a 
> friendly
> discussion regarding ions and colloids.  I said the silver ions were 
> dissolved in the
> water.  He said that was not true....an ion was an atom missing an electron 
> in the
> outer ring or one with an additional electron in the ring.  He went on to 
> state that
> the atom was still an atom and was not dissloved but just in intimate contact 
> with
> and intimitely surrounded by the water.  He stated that the atom does not 
> dissolve by
> being in the water.
>
> I tried to look it up but am not a chemist or physiscist so this is way over 
> my head.
> I did see a couple of sites that showed an artist rendition of an atom 
> surrounded by
> water but not dissolved even though by definition it was called "dissolved".
>
> I saw many CS sites that say the ions are dissolved but I suspect many of 
> them are
> just spouting what they saw on another CS site so I would like a definitive 
> simple
> explanation if anyone can give it.
>
> Thanks.
>
> Trem
>
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