37

Sept. 8, '49

H₂PtCl₆ ⋅ 6 H₂O 5% solⁿ 27.6 c.c.

H₂PtCl₆ ⋅ 6 H₂O evaporated to dryness turned to a
dark brown substance, which was dissolved in HCl
& conc. H₂SO₄. Added NH₄OH to the solⁿ. A
yellow precipitate was obtained. It is
(NH₄)₂PtCl₆. Evaporated the filtrate. Precipitated
again with NH₄OH. Repeated 3 times until
not too much pt left in solⁿ (the color of solⁿ
is very light). Fused (NH₄)₂PtCl₆ in a crucible.
Platinum sponge was obtained. It weighed 684 mg
Dissolved Pt sponge in aqua regia.

H₂PtCl₆ ⋅ 6 H₂O recovered.

29.334
28.650
0.684 gm Pt