Studies of the Catalytic Action of Mineral Springs. IV

Catalatic Action of Artificial Acidic Iron Solution. (4). Promotory Action of Cu²⁺

Abstract

Catalatic action of artificial mineral spring of acidic iron containing copper is in inverse proportion to the product of hydrogen ion concentration and 0.5 power of total sulfate concentration, as in the case of catalatic action of the iron spring not containing copper, and directly proportional to the total iron concentration. This fact shows that copper ion catalyzes simple iron ion but not iron sulfate ion. Therefore, artificial acid vitriol spring and acid iron alum spring, containing equal concentration of simple iron (III) concentration and copper ion, have the same degree of catalatic action. The accelerative effect of copper ion is independent of iron ion concentration and reaches. the maximum when copper ion concentration is 10^-2M. At a greater concentration than this, there is no increased accelerative action of copper ion. The degree of catalatic activity becomes approximately 15 times greater, when copper ion concentration is 10^-2M. Relationship between copper ion concentration and degree of acceleration is indicated by a primary sigmoid curve, p=[Cu²⁺]/[Cu²⁺]+1.8×10^-6.