Dear Tony,
> In an old patination 'recipe' I'm investigating there is a
>reference to 'platinic chloride'.
>
>Is that likely to be just 'platinum chloride' - if there is such a
>compound - in today's terminology?
Platinic is the adjectival form, alright. According to the
wonderfully subjunctive language ofJ.
W. Mellor's _Modern Inorganic Chemistry_ (published 1927): "If platinum
chloride be crystallized from a solution acidified with hydrochloric acid,
or if an aqua regia solution of the metal be evaporated a number of times
with an excess of hydrochloric acid to drive off the nitric acid,
reddish-brown deliquescent crystals of the complex acid H2PtCl6.H20 (sorry
about the subscripts!) are formed. This substance--the 'platinum chloride'
of commerce--is really hydrochloroplatinic acid. The acid is dibasic, and
it forms a characteristic series of complex salts--the chlorplatinates."
(p. 785-6). It appears that in the past, at least, you could obtain a form
of platinum chloride commercially.
cheers,
Peter
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Peter Mayer [EMAIL PROTECTED]
Politics Department tel: +91-8-8303-5606/
+91-8-8303-5610
University of Adelaide fax: +91-8-8303-3446
Adelaide, SA 5005
Australia
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