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absorption acid activity added addition Akad alkali ammonia ammonium analysis anhydrous aqueous solutions atoms band bond calculated Chem chemical Chemistry chloride cm-¹ coefficients complex components composition compounds concentration conductivity constant containing coordination copper corresponding crystals curve decomposition decrease density dependence determined effect equation equilibrium experimental experiments extraction fluoride formation formed frequencies given gives H₂O heating hydrates hydrogen hydroxide increase indicates infrared Inorg ionic ions Khim liquid measured metal method mixture mole molecules Moscow Nauk Neorg nitrate observed obtained organic phase oxide phase phosphate platinum potassium precipitate prepared present quantity range ratio reaction Russ salt separated shown shows similar sodium solid solubility solutions specimens spectra spectrum SSSR stability structure studied Table takes temperature thermal tion values vibrations weight X-ray Zhur