Synthesized octanoates of silver and cadmium have been studied by chemical, X-ray phase, thermogravimetric, and IR-spectroscopic methods of analysis, their composition has been defined. By means of X-ray phase analysis method it has been established that the obtained octanoates contain no impurities of initial substances. Metals content identification test of octanoates under study has shown that the synthesized compounds correspond to AgC7H15COO and Cd(C7H15COO)2. Thermogravimetric and IR-spectroscopic analysis have confirmed the lack of additional ligands. In IR spectrum of cadmium octanoate the splitting of valent symmetric and antisymmetric fluctuations allows to assume the existence of several types of coordination of anions of acid to the atom of metal. Decomposition products, according to the calculations of the decrease of mass on thermograms, are Ag and CdO, which has also been confirmed by the results of solid residues X-ray phase analysis. The results of thermogravimetric analysis are confirmed by the available literature data on thermal stability of salts of carbonic acids changing in the following sequence: silver copper cadmium zinc barium calcium.