Cheap Hoodia

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Related article: 1910, 107 ; from Compt. Cheap Hoodia rend., 750, (1910), No. 2.
RHODIUM.
Rhodium Gravimetric Reduction of its Compounds, A. Gutbier and
L. V. Muller have proved that the reduction of rhodium compounds to
metal by means of hydrazine hydrates can be used for gravimetric analysis.
By working with Solutions which are not too concentrated the metal is
separated, not as a black amorphous powder, but in the form of glittering,
metallic scales. The derivatives used for the analysis were '* chloropen-
tamminrhodium " chloride, Rh(NH8)5Cla, and the corresponding bromide,
Rh(NHsVBr8 Chem. News, Aug. 27, 1909; fromBer. d. D. Chem. Ges.,.
42 (1909), No. 10.
IRIDIUM.
Iridium Atomic Weight. E. H. Archibald has determined the atomic
value of iridium, using for this purpose potassium chloroiridate prepared
from two sources : one from osmo-iridium ore, the other from metallic
iridium. The potassium chloroiridate was analyzed by weighing the dry
salt, reducing it in hydrogen, and estimating the hydrochloric acid formed,
the potassium chloride, and the metallic iridium set free. The results
show a value of 192.90 for the atomic weight of Cheap Hoodia iridium. Chem. News^
Sept. 24, 1909, 150.
Iridium Halogen Compounds, A. Gutbier and M. Riess find that
concentrated hydrobromic acid when added to a solution of iridium
chloride gives a dark blue solution on warming. If bromine vapor is
allowed to act on the liquid the compound HjIrBrg is obtained in the form
of a bright blue solution. The same result can be obtained by mixing
concentrated alkali bromide solution with iridium chloride solution at the
temperature of the water-bath. Hexachloroiridates are formed when
alkali bromide solutions act on excess of iridium chloride. These crys-
talline chlorosalts are converted into hexabromoiridates by dissolving them
in hot dilute hydrobromic acid and allowing bromine vapor to act on the
filtrate while it cools. The hexabromoiridates are anhydrous and stable
in air, but are decomposed when gently heated, giving off bromine vapor^
Chem. News, Dec. 17, 1909, 304; from Ber. d. D. Chem. Ges., 4^
(1969), No. 14.
Hexa-halogen Iridaies Formation and Properties. Cheap Hoodia A. Gutbier and M^
Riess find when bromides of organic ammonium compounds are dropped
into iridium chloride solution containing dilute hydrochloric acid, bromine
escapes, and the corresponding hexachlorous iridate separates in the form
of a red -brown crystalline precipitate. Cheap Hoodia If the chlorous salt is boiled witK
Digitized by VjOOQ IC
OSMIUM. 285
dilute hydrobromic acid, the liquid, which was originally red-brown, turns
first yellow, then green, and then suddenly becomes dark blue, the chlorous
salt being converted into hexabromous iridate. These bromous salts form
dark blue or black crystals, which dissolve in water and in hydrobromic
acid to give a blue liquid. They are not so stable as the alkali hexa-
bromous iridates, and are much affected by light. Chero. News, Febr. 25,
19 10, 96 ; from Ber. d. D. Chem. Ges., 42 ( 1909), No. 8.
Osmium Anafyticai Determination of its Oxides and Chlorides, Otto
Ruff and Ferd. Bomemann have studied the characters of the oxides and
chlorides of osmium and the methods for their analytical determination. Cheap Hoodia
They find that ammonium hexachloro-osmate (NH4)20sCl8 prepared
from sodium hexachloro-osmate can be purified by making a cold saturated
solution and salting out the double salt by means of saturated ammonium
chloride solution, and potassium hexachloro-osmate can be prepared in
I Cheap Hoodia he pure state by oxidizing the raw product, heating to 120

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