Rhodium potassium sulfate

Principal Compounds Rhodium trichloride rhodium trioxide rhodium (II) acetate rhodium nitrate rhodium potassium sulfate rhodium sulfate rhodium sulfite... 

DEKTAL DEVELOPER KODAK FIXER KODAK SHORT STOP POTASSIUM ALUM POTASSIUM BICARBONATE POTASSIUM BICHROMATE POTASSIUM BORATE POTASSIUM BROMATE POTASSIUM BROMIDE POTASSIUM CARBONATE POTASSIUM CHROMATE POTASSIUM CHLORATE POTASSIUM CHLORIDE POTASSIUM CYANIDE POTASSIUM DICHROMATE POTASSIUM FERRICYANIDE POTASSIUM FERROCYANIDE POTASSIUM FLUORIDE POTASSIUM HYDROXIDE POTASSIUM NITRATE POTASSIUM PERBORATE POTASSIUM PERCHLORATE POTASSIUM PERMANGANATE. 10% POTASSIUM SULFATE PROPANE PROPANE GAS PLATING SOLUTIONS BRASS CADMIUM COPPER GOLD INDIUM LEAD NICKEL RHODIUM SILVER TIN ZINC... 

Manganous acetylacetonate Manganic acetylacetonate Ferrous acetylacetonate Ferric acetylacetonate Cobaltic acetylacetonate Rhodium chloride Nickel acetylacetonate Potassium platinous chloride Tetrammine copper (II) sulfate Potassium gold cyanide... 

Although compounds of the platinum metals are commercially available, many workers, for reasons of economy, prefer to prepare them from the elements. Rhodium, one of the rarest and most expensive of the platinum metals, is not attacked by acids (even aqua regia), and its dissolution in alkaline fusion mixtures (e.g., fused sodium carbonate and potassium nitrate mixtures) or in molten salts (e.g., molten potassium hydrogen sulfate) is inefficient and tedious. Chlorination during heating yields a mixture of water-insoluble chlorides, but in the presence of sodium... 

M.p. 1970 °C. Harder and more difficult to work than Pt. The solid metal and the fine rhodium black powder obtained by reduction from salt solutions differ in their solubility in acids. The solid metal is insoluble in all acids and mixtures of acids, and is not attacked by molten NaOH even if KNO3 is added at dull red heat. If Rh is fused with KHSO4, it slowly forms the water-soluble potassium rhodium sulfate, which imparts a dark-red color to the melt at high Rh concentrations, the melt becomes black. 

Piccini was obsessed with studying the limiting form of the elements as placed in the periodic table. With this in mind, he took up a new field of research, the synthesis of double sulfates (or alums), a work that enormously stimulated his creativity and enthusiasm [58]. In rapid succession, he prepared the alums of vanadium [59], titanium [60, 61], rhodium [62], manganese [63], iridium, and, finally, of thallium [64] with ammonium and then with the following alkaline metals cesium, mbidium, and potassium. Piccini ably used his method of synthesizing the rhodium sulfates virtually to quantitatively separate rhodium from iridium in solution. Through successive fractional crystallizations, Piccini obtained the alums of rhodium and cesium free of iridium, and through electrolysis of the alums he was able to obtain pure rhodium. 

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