U of S | Mailing List Archive | alt-photo-process-l | Re: formula for platinum standard solution #3 ?

Re: formula for platinum standard solution #3 ?



Hi Tom,

If I understand your question correctly, you have ammonium
tetrachloroplatinate in either powder or liquid form, from which you
want to make the traditional standard Pt solution which is 20%
Potassium Chloroplatinate (K2PtCl4). I'm no chemist, but I don't
think it is possible, at least not without somehow removing the
ammonium. Sodium chloride is definitely not involved. That is
probably why you can't find a formula.

From Arentz, the formula for making the standard Pt solution from
powdered K2PtCl4 is:
50 ml distilled water @100
10 gm potassium chloroplatinate

From Ware & Malde, the formula for making ammonium
tetrachloroplatinate from powder is:
5 gm ammonium tetrachloroplatinate (II)
20 ml distilled water

You probably have these formulas already and were hoping to find
something else, but I don't think it exists. Maybe one of the
chemists on the list will chime in.

Hope this helps,
Keith

www.jkschreiber.com


On Jul 11, 2009, at 7:52 PM, Tom Hawkins wrote:

Listmembers,

Could someone provide the formula for platinum standard solution
#3, using ammonium tetrachloroplatinate?

Many thanks,
Tom


Tom Hawkins
tomehawk@ix.netcom.com

www.tomhawkinsphotographs.com