[Histonet] (no subject)

[John A. Kiernan]

Could your "iodine" really be iron or magnetic
iron oxide? Magnets don't pick up bits of iodine!
Iodine is insoluble in water but it dissolves
quite quickly in an aqueous solution of potassium
iodide.

It's good to see that you're correctly calling the
solution Gram's iodine. Many people call it
Lugol's, which is a stronger solution (6% iodine
in 4% KI).
-- 
-------------------------------
John A. Kiernan
Department of Anatomy and Cell Biology
The University of Western Ontario
London,   Canada   N6A 5C1
   kiernan[AT]uwo.ca
   http://publish.uwo.ca/~jkiernan/
   http://instruct.uwo.ca/anatomy/530/index.htm
_______________________________
meint002 wrote:
> 
> Dear Histos,
> 
> I am trying to make a Gram's Iodine solution (1g iodine, 2g potassium iodide,
> 100ml distilled water to start)and I can't get the iodine to go into
> solution.  If I use a stir bar the iodine is attracted to the magnet and
> doesn't come off.  I've also tried heat and that doesn't seem to work either.
>  All the text books I've looked at say shake until dissolved.  Tried that,
> the iodine just sits in the bottom of the beaker and nothing.
> 
> I don't remember having this problem before in school.  All suggestions are
> welcome.  Thanks in advance.
> 
> Joyce Meints
> 
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