An Introduction to the Chemistry of Complex Compounds by Aleksander Abramovich Grinberg

By Aleksander Abramovich Grinberg

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This chlorine acts like that which enters into the structures of chloro-organic compounds. Thus, the study of the double decomposition reactions in which the purpureo salts participate, leads to the conclusion that they disso­ ciate into three ions in aqueous solution. This conclusion is verified by the mea­ surement of their molar conductances. Actually the molar conductance, ^, of a solution of [Co(NH3)5Cl]Cl2 for which V = 1,000 1/mole and t = 25°, is 261 (compare pp. 5 and 26). Just as the luteo salt, which was studied in the preceding section, was char­ acteristic of the salts of the hexammine type, having the general formula [MA6]Xn, the purpureo salt is a representative of the so-called acidopentammine type.

In the text to follow mention will be made of similar reactions, in which anions act as bridging groups between two metal atoms. The addition of AgN0 3 to a complex ion containing chlorine should bring about precipitation of AgCl when the concentration of the chloride ions set free by the equilibrium is sufficient to exceed the solubility product constant for AgCl. In this case if the addition product with the silver salt and the complex is not readily soluble, it is possible that a mixture of silver chloride and of the corresponding addition product will precipitate out.

The question of t h e composition of t h e complex cation of t h e roseo salt can now be considered as decided a n d this salt can be expressed b y t h e formula [Co(NH 3 ) 5 H 2 0]Cl 3 . The reason for t h e acid reaction of solutions of t h e roseo salt will be explained in Chapter I X , page 240. However, it should be emphasized t h a t t h e acid pro­ p e r t y of t h e roseo salt is a convincing a r g u m e n t in favor of t h e formula which has been accepted. The question of t h e function of t h e water in t h e aquo salts, of which the roseo salt of cobalt is one of t h e simplest representatives, is very i m p o r t a n t , not only from t h e standpoint of t h e chemistry of complex compounds, b u t also from t h e standpoint of the s t u d y of solutions.

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