Solubility of various Pt salts

[Linas Kudzma <lkudzma@earthlink.net>]

Here is some useful solubility data for various Pt+2 and Pt+4 salts. This
supports our speculations about the precipitate in the Extravagatype. It
also raises the question, why isn't Na2PtCl4 commonly used in Pt printing?
It's more soluble than the more readily available potassium salt. It would
seem that the sodium salt Na2PtCl4 could be used without warming the
solution.


                      Solubility in 100ml H2O
Compound      cold water / hot water

(NH4)2PtCl4      soluble / soluble

(NH4)2PtCl6      0.7 g  / 1.25

K2PtCl4              0.9 g / 5.3 g

K2PtCl6              0.5 g / 5.2 g

Na2PtCl4          soluble / soluble

Na2PtCl6          soluble / soluble

Li2PtCl6            soluble  soluble

----- Original Message -----
From: "Erich Camerling" <e.camerling@freeler.nl>
To: "alt-photo" <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, May 15, 2002 1:18 AM
Subject: Re : Extravagatype and Na2


> Linas,
> I think you are right when you suppose that the precipitate is
(NH4)2PtCl6.
> When I mix 1 drop Ammonium Ferric Oxalate (40 g / 100 ml ) with 1 drop
> Na2PtCl6 ( 20 g / 100 ml ) there immediately arises a precipitate.
> When I mix 1 drop K2PtCl4 ( 20 g / 100 ml ) with 1 drop of Na2PtCl6  ( 20
g
> / 100 ml ) there slowly arises a precipitate but less then with AFO + Na2.
> Unfortunately I don't know the solubility data from K2PtCl6 and
> (NH4)2PtCl6.I only know that K2PtCl6 is nearly insoluble.I called for data
> to Drijfhout ( famous Dutch precious metal supplier,present
Engelhard-Clal )
> after  searching   in the Gmelin : part Pt,
> but even they didn't have data.On Internet I also couldn't find data.
>
> Erich
>
>
>