A Comprehensive Treatise on Inorganic and Theoretical Chemistry

330 INORGANIC AND THEORETICAL. CHEMISTRY
platinate, TlPtCl6, by adding hydrochloroplatinic acid to a dil. soln. of a thallous
salt. One hundred parts of water at 15° dissolve 000638 part of salt, and at
100°, 0-0513 part. G. Fngel gave «=9-755 A. for the cubic lattice. .G. Werther,
and M. Hibberling observed that no precipitate of thallic chloroplatinate is formed
when a thallic salt is added to hydrochloroplatinic acid.
S. Jolin,3o j . c. G. dc Marignac, and P. T. Cleve prepared cerous chloroplatinate,
CeCl3.PtCl4.13H2O, in quadratic, orange plates which are hygroscopic and lose
9 mols. of water at 110°. According to S. Jolin, and P. T. Cleve, the salt is very
soluble in water, and alcohol. M. Holtzmann obtained deliquescent, orange
prisms of 4CeCl3.3PtCl4.24H20, which melt on the water-bath, and are soluble
in water, and alcohol. P. T. Cleve, and J. C. G. de Marignac prepared lanthanum
Chloroplatinate, LaCl3.PtCl4.13H2O, in orange, tabular crystals isomorphous with
those of the cerium salt. The chloroplatinate is very soluble in water. F. T. Frerichs
and E. F. Smith prepared a similar salt, L.a2(PtCl6)3.24H20. C. von Scheele
prepared praseodymium chloroplatinate, PrCl3-PtCl4.12H2O, in yellow crystals
of sp. gr. 2-412. J. C. G. de Marignac prepared the " didymium " salt. P. T. Cleve
obtained samarium chloroplatinate, SmCl3.PtOl4.10£ H2O, in orange, deliquescent
prisms of sp. gr. 2-712; C. Benedicks, gadolinium chloroplatinate, GdCl3.PtCl4.
1OH2O, in orange-yellow prisms, of sp. gr. 2*719 ; L. F. Nilson, and P. T. Cleve,
yttrium chloroplatinate, 4YCl3.5PtCl4.51 (or 52)H20, in red, deliquescent prisms,
which melt at 100° with the loss of 10 mols. of water ; P. T. Cleve, erbium chloroplatinate,
ErCl3.PtCl4.10^H2O, in deliquescent plates which lose 3 mols. of water
over sulphuric acid ; P. T. Cleve prepared ytterbium chloroplatinate, 2YbCl3.-
PtCl4.22H2O, in reddish-brown, deliquescent, rhombic plates, which effloresce in
a desiccator, lose 11 mols. of water at 100° and melt below that temp. There
is also a hydrate with 35 mols. of water. P. T. Cleve, thorium chloroplatinate,
ThCl4PtCl4.12H2O, in orange, deliquescent, tabular crystals, and L. F. Nilson,
zirconyl chloroplatinate, (ZrO)PtCl6.12H2O, from a soln. of zirconyl chloride and
hydrochloroplatinic acid, in pale yellow, four-sided prisms which melt below 100°
with the loss of 6 mols. of water.
L.. F. Nilson 31 obtained stannic chloroplatinate, SnPtCl8.12H2O, by evaporating
to dryness on a water-bath a mixture of about 2 mols. of hydrochloroplatinic
acid and 1 mol. of stannic chloride, extracting the mass with water, evaporating
the soln. for crystallization, and drying the crystals between bibulous paper.
The pale yellow plates do not change in dry air, but deliquesce in moist air ; they
lose 2 mols. of water at 100°. K. Birnbaum, H. Topsoe, and P. Rohland prepared
lead Chloroplatinate, PbPtCl0.3(or 4)H20, by evaporating soln. of the theoretical
proportions of the constituent chlorides. The pale yellow or orange-red, cubic
crystals were found by H. Topsoe to have a sp. gr. of 3-681, and a mol. vol. of 182-4.
The crystals are stable in air, and they effloresce over sulphuric acid. According
to H. Topsoe, the crystals lose all their water at 125°, but W. Peters found that
some water is retained at 200°. K. Birnbaum found that the salt is soluble in water,
and in alcohol, and H. Topsoe, and W. Peters observed that the salt in aq. soln.
partially decomposes, forming sparingly soluble lead chloride and soluble platinic
chloride.
Ii. F. Nilson a 2 prepared chromic chloroplatinate, CrCl3.PtCl4.10H2O, by
evaporating on a water-bath a soln. of equimolar proportions of hydrochloroplatinic
acid and green chromic chloride, extracting the dry mass with water,
evaporating the soln. over sulphuric acid, and drying the crystals between bibulous
paper. G. O. Higley washed the crystals with acetone, and dried them on a porous
tile over sulphuric acid. The dark green, thin rhombic plates effloresce slowly in
dry air ; they lose all but IO mols. of water at 100°. They are freely soluble in
water and in alcohol, but almost insoluble in acetone. G. O. Higley treated a soln.
of the salt with silver nitrate and obtained silver chloroplatinate with a trace of
silver chloride, and he inferred that the salt is a complex with doubled water
molecules, [Cr(H4O2^5Cl]PtCl6. P. T. Cleve prepared chromic chloroaquo-