Rubidium perchlorate solubility

Rubidium perchlorate, RbC104.—When rubidium chlorate is heated to a moderate temperature, it is converted into a mixture of perchlorate and chloride. The perchlorate is isomorphous with the corresponding potassium salt, but is less soluble in water, the solubility at 21-3° C. being 1-09 grams in 100 grams of water.13... 

Fig. 32.—Solubilities of Potassium, Rubidium, and Caesium Perchlorates in Water.

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. 

Rubidium salts impart a reddish-violet coloration to the Bunsen flame, similar to that characteristic of potassium derivatives. Like potassium, rubidium forms several salts not readily soluble, among them the chloroplatinate, perchlorate, silicofluoride, bismuth thiosulphate, and primary tartrate. It can also be detected by the formation of Bi(N02)3,2RbN02,NaN02, a yellow crystalline precipitate produced by adding a solution of bismuth nitrate and sodium nitrite to one of a rubidium salt.2... 

Most commercial perchloric acid is used to manufacture perchlorate salts. Perchlorates of almost all metals are known, and except for potassium, rubidium, and cesium, they are quite soluble in water. The perchlorates of greatest industrial importance are NH4CIO4 (a solid rocket propellent), Mg(C104)2 (an electrolyte in dry-cell batteries), and KCIO4 (used in fireworks and flares). 

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