Rubidium chromate

Some compounds, such as rubidium chromate and rubidium iodide, emit toxic vapors when heated. Other compounds, such as rubidium perchlorate, are irritants. 

Rubidium Chromate, Rb2Gr04, crystallises in the bipyramidal class of the rhombic system ... 

L. Grandeau prepared rubidium chromate, Rb2Cr04, by neutralizing a soln. of the dichromate with rubidium carbonate, and by melting chromic oxide with rubidium nitrate, or with rubidium carbonate in air. The spontaneous evaporation of the aq. soln. furnishes first a crop of crystals of the dichromate, and then the... 

Rubidium metal alloys with the other alkaU metals, the alkaline-earth metals, antimony, bismuth, gold, and mercury. Rubidium forms double haUde salts with antimony, bismuth, cadmium, cobalt, copper, iron, lead, manganese, mercury, nickel, thorium, and 2iac. These complexes are generally water iasoluble and not hygroscopic. The soluble mbidium compounds are acetate, bromide, carbonate, chloride, chromate, fluoride, formate, hydroxide, iodide. 

The electrical conductivities of soln. of a great many compounds in liquid hydrogen halides have been measured by E. H. Archibald and D. McIntosh. The conductivity is raised considerably by phosphoryl chloride. Sodium sodium sulphide, borate, phosphate, nitrate, thiosulphate, and arsenate chromic anhydride potassium nitrate, hydroxide, chromate, sulphide, bisulphate, and ferro- and ferri- cyanide ammonium fluoride and carbonate j rubidium and caesium chloride magnesium sulphate calcium fluoride ... 

Uses Of the Stassfurt salts.—The magnesium compounds in the Stassfurt salts are used for the preparation of magnesium and of its salts. The potash salts are an essential constituent of many fertilizers used in agriculture, etc. 22 and potassium chloride is the starting-point for the manufacture of the many different kinds of potassium salts used in commerce—carbonate, hydroxide, nitrate, chlorate, chromate, alum, ferrocyanide, cyanide, iodide, bromide, etc. Chlorine and bromine are extracted by electrolysis and other processes from the mother liquids obtained in the purification of the potash salts. Boric acid and borax are prepared from boracite. Caesium and rubidium are recovered from the crude carnallite and sylvite. 

H. Stamm also measured the solubilities of the salts of the alkalies in liquid ammonia —potassium hydroxide, nitrate, sulphate, chromate, oxalate, perchlorate, persulphate, chloride, bromide, iodide, carbonate, and chlorate rubidium chloride, bromide, and sulphate esesium chloride, iodide, carbonate, and sulphate lithium chloride and sulphate sodium phosphate, phosphite, hypophosphite, fluoride, chloride, iodide, bromate, perchlorate, periodate, hyponitrire, nitrite, nitrate, azide, dithionate, chromate, carbonate, oxalate, benzoate, phtnalate, isophthalate ammonium, chloride, chlorate, bromide, iodide, perchlorate, sulphate, sulphite, chromate, molybdate, nitrate, dithionate, thiosulphate, persulphate, thiocyanate, phosphate, phosphite, hypophosphite, arsenate, arsenite, amidosulphonate, ferrocyanide, carbonate, benzoate, methionate, phenylacetate, picrate, salicylate, phenylpropionate, benzoldisulphonate, benzolsulphonate, phthalate, trimesmate, mellitate, aliphatic dicarboxylates, tartrate, fumarate, and maleinate and phenol. 

Double Chromates.—Several double chromates containing nickel have been prepared. Amongst these are potassium nickel chromate,3 K2Cr04.NiCr04.6H20, and the corresponding ammonium, rubidium, and ccesium salts. Basic chromates have also been described.4... 

Perphosphates of rubidium and caesium are more easily prepared, even in the absence of fluorides or chromates. The permonophosphates of these metals however require in their preparation rather higher current-densities.2... 

Lead was found frequently at the 0-10 /xg/cm2 level in many old papers, possibly picked up from processing equipment. The wt % of the 325 /xg/cm2 of lead as the chromate, PbCr04 (8), found in the Amies yellow paper, basis weight 0.92 g/dm2, is 325/0.92 X 01 = 3.5%. Antimony appeared randomly at the 0-2-/xg/cm2 level. Other elements found but not plotted were titanium, cerium, cesium, gallium, mercury, rubidium, strontium, vanadium, yttrium, and zirconium. 

An unstable monoclinic form, isomorphous with rubidium and ammonium dichromates, has been obtained adnhxed with the triclinic variety, by concentrating, after filtration from aluminium hydroxide, a mixture of potassium chromate and aluminium sulphate, and allowing the solution to crystallise. It may also be obtained in yellowish brown, doubly refracting monoelinic plates by crystallisation of a mixture of solutions of potassium diehromate and potassium thiocyanate. ... 

The simple rubidium salts such as the halides and nitrate have small xq values giving rise to narrow resonances, whereas the chromate, acetate, sulphate and hydroxide have larger Xq values giving wider central transition lineshapes (Cheng et al. 1990). The NMR interaction parameters of a number of rubidium compounds are collected in Table 10.5. 

BENSULFOID (7704-34-9) Combustible solid (flash point 405°F/207°C). Finely divided dry materia forms explosive mixture with air. The vapor reacts violently with lithium carbide. Reacts violently with many substances, including strong oxidizers, aluminum powders, boron, bromine pentafluoride, bromine trifluoride, calcium hypochlorite, carbides, cesium, chlorates, chlorine dioxide, chlorine trifluoride, chromic acid, chromyl chloride, dichlorine oxide, diethylzinc, fluorine, halogen compounds, hexalithium disilicide, lampblack, lead chlorite, lead dioxide, lithium, powdered nickel, nickel catalysis, red phosphorus, phosphorus trioxide, potassium, potassium chlorite, potassium iodate, potassium peroxoferrate, rubidium acetylide, ruthenium tetraoxide, sodium, sodium chlorite, sodium peroxide, tin, uranium, zinc, zinc(II) nitrate, hexahydrate. Forms heat-, friction-, impact-, and shock-sensitive explosive or pyrophoric mixtures with ammonia, ammonium nitrate, barium bromate, bromates, calcium carbide, charcoal, hydrocarbons, iodates, iodine pentafluoride, iodine penloxide, iron, lead chromate, mercurous oxide, mercury nitrate, mercury oxide, nitryl fluoride, nitrogen dioxide, inorganic perchlorates, potassium bromate, potassium nitride, potassium perchlorate, silver nitrate, sodium hydride, sulfur dichloride. Incompatible with barium carbide, calcium, calcium carbide, calcium phosphide, chromates, chromic acid, chromic... 

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