金屬マグネシウムと種々の鹽類水溶液との化學反應に就て : 定性的研究の部

概要

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Metallic Magnesium reacts with chloride solution with such a speed as that of the dissolution of zinc in acids. An equivalent quantity of hydrogen is evolved and Cl^- ion remains constant. The author investigated the chemical reaction between metallic magnesium and aqueous solutions containing various salts. Impurities of the metal, gases dissolved in the solution such as O_2, N_2, CO_2, and OH^- ion caused no reaction. Among the anions, only Cl^- ion showed an intense reaction, the others acted scarcely upon magnesium. Cl^- ion participates directly and intimately in the reaction mechanism, but H^+ ion seems to be indifferent. Factors involved in the reaction mechanism are, therefore, limited to Mg atom, water molecule and Cl^- ion. Various theories and opinions ever proposed were discussed and all were found to be incorrect. The author's view at present is as follows : Chemical reaction takes place between Mg atom, H_2O or (H_2O)_3 molecule and Cl^- ion, expelling gaseous hydrogen and some intermediate compound is formed. In the next moment, decomposes this compound again precipitating Mg(OH)_2 and recovering Cl^- ion. This ion causes again the same reaction, thus, acting as a kind of catalyser.
社団法人日本鉄鋼協会の論文
1930-04-25