The pungent smelling salts snapped her out of the in-between place.
Two oxides of iridium are known, namely the sesquioxide, Ir203, and the dioxide, Ir02, corresponding to which there are two series of salts, the sesqui-salts and the iridic salts; a third series of salts is also known (the iridious salts) derived from an oxide IrO.
This hydroxide is soluble in well cooled acids, forming solutions which contain cobaltic salts, one of the most stable of which is the acetate.
The barium and magnesium salts of this acid are formed when baryta and magnesia are fused with cobalt sesquioxide.
The cobaltous salts are formed when the metal, cobaltous oxide, hydroxide or carbonate, are dissolved in acids, or, in the case of the insoluble salts, by precipitation.
The insoluble salts are rose-red or violet in colour.
The soluble salts are, when in the hydrated condition, also red, but in the anhydrous condition are blue.
They are precipitated from their alkaline solutions as cobalt sulphide by sulphuretted hydrogen, but this precipitation is prevented by the presence of citric and tartaric acids; similarly the presence of ammonium salts hinders their precipitation by caustic alkalis.
It may be prepared in the amorphous form by heating cobalt with sulphur dioxide, in a sealed tube, at 200° C. In the hydrated condition it is formed by the action of alkaline sulphides on cobaltous salts, or by precipitating cobalt acetate with sulphuretted hydrogen (in the absence of free acetic acid).
The double salts containing the metal in the cobaltic form are more stable than the corresponding single salts, and of these potassium cobaltinitrite, C02(N02) 6 '6KN02.3H20, is best known.
For a description of the various salts of this acid, see P. Wesselsky, Berichte, 1869, 2, p. 588.
A large number of cobalt compounds are known, of which the empirical composition represents them as salts of cobalt to which one or more molecules of ammonia have been added.
These salts have been divided into the following series: Diammine Series, [Co(NH3)2]X4M.
In these salts X = NO 2 and M = one atomic proportion of a monovalent metal, or the equivalent quantity of a divalent metal.
Croceo-salts [(N02)2Co(NH3)4]X, which may be considered as a subdivision of the praseo-salts.
Tetrammine purpureo-salts [RCo(NH3)4 H20]X2.
Tetrammine roseo-salts [Co(NH3)4 (H20)21X3.
Fuseo-salts [Co(NH 3)4]OH X2.
Pentammine purpureo-salts [R Co(NH 3) 5 ]X 2 where X = Cl, Br, N03, N02, 1S04, &c.
Pentammine roseo-salts [Co(NH 3) 6 H 2 O] X2.
The hexammine salts are formed by the oxidizing action of air on dilute ammoniacal solutions of cobaltous salts, especially in presence of a large excess of ammonium chloride.
The pentammine purpureo-salts are formed from the luteo-salts by loss of ammonia, or from an air slowly oxidized ammoniacal cobalt salt solution, the precipitated luteosalt being filtered off and the filtrate boiled with concentrated acids.
The pentammine nitrito salts are known as the xanthocobalt salts and have the general formula [NO 2 Co (NH 3) 3]X2.
They are formed by the action of nitrous fumes on ammoniacal solutions of cobaltous salts, or purpureo-salts, or by the mutual reaction of chlorpurpureosalts and alkaline nitrites.
The pentammine roseo-salts can be obtained from the action of concentrated acids, in the cold, on airoxidized solutions of cobaltous salts.
This acid cannot be isolated in the free condition, but many of its salts are known.