Re : Extravagatype and Na2

[Erich Camerling <e.camerling@freeler.nl>]

Linas,
The Handbook of Chemistry and Physics (the Rubber Bible) gives data for the
solubility (in grams per 100 ml H2O) by a given temperature (in degrees
Celcius !) from the following Platinum salts :
(NH4)2PtCl6              :    0.7 at  15    and      1.25  at   100
(NH4)2PtCl4              :    soluble in cold and warm water
Na2PtCl6                   :    soluble in cold water and very soluble in
hot water
Na2PtCl6.6H2O        :    66  at   15    and      very soluble in hot water
Na2PtCl4                   :    no data
Na2PtCl4.4H2O        :    soluble in cold water
K2PtCl6                    :    0.481 at 2    and     5.22  at  100
K2PtCl4                    :    0.93   at  15  and    5.3    at  100
(strange, for B&S sells a 20% solution ! )

Michael Ware writes in his article " An investigation of Platinum  and
Palladium Printing " (The Journal of Photographic Science .Vol .34,1986
,page 13 pp) that the solubility of Na2PtCl4 is some 17.8 at 20  and the
solubility of (NH4)2PtCl4    is about 25 at 20.

Erich