Abstract
1. Two types of equations expressing the velocity of acid neutralizing reaction of antacids were discussed. One was the calcium carbonate type, for which the initial increase of pH, (dx/dt)t=0, was convenient to compare the velocity of reaction. The other was DAHG type, for which the apparent order of reaction, n, the finished time, t∞, and the pH flexional time, tυ, were convenient to compare the antacid reactivity quantitatively.2. The activation energy of reaction between powdered marble and hydrochloric acid was estimated to be about 6, 400 calories.3. The velocity of reaction between DAHG and acid depended upon the kind of samples or acids used.4. The activation energy of reaction between DAHG and acid was estimated to be about 20, 000 colories.5. The rapid increase of pH at the initial stage of reaction between DAHG and acid was considered to be due primarily to the absorption of acid by the test sample.6. The change of pH at the final stage of reaction between DAHG and acid was considered to be dependent upon the hydrolysis of aluminum ion produced and the adsorption effect of the test sample.
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