Abstract
In the present study, first of all, several sample glasses have been made by replacing one after another the lime contents with cobalt oxide while keeping constant the amounts of alkali and silica contents in alkali-lime-siliea glass. Examination have been given in these glasses with respect to how the chemical properties therein are changed as the amount of cobalt oxide increases and the amount of lime decreases.The effects on chemical properties have been studied according to the changes in the solubility on water, 20.24% HCl, 2N-sodium carbonate solution, and 2N-sodium hydroxide solution, by employing the powder method.As a result of experiments it has been found that no marked changes have occurred in the solubility of glasses due to the alterations of both lime and cobalt oxide contents in glass compositions however, in the case where the amount of lime and that of cobalt oxide are equal the solubility thereof has been observed to be slightly greater than in other cases. And it has also been found that the solubility of glasses with respect to hydrochloric acid is always small and not changed, with irrespective to the amounts of lime and cobalt oxide contents in the composition of glasses.
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