| Study of the Equilibrium pH of Some Commercial
and Experimental Glasses and their Relationship
with Chemical Durability |
C. R. DAS
Pages : 41-45
DOI : 10.1080/0371750X.1968.10855628 |
| Abstract |
| Chemical equilibrium was allowed to attain at the glass solution interface of some
commercial and experimental glasses and the pH values measured at equilibrium
were compared with the results of alkali extraction from previous investigations. The
effects of alkali and alumina on the equilibrium pH were studied. The pH values were
found to be highly influenced by the composition of glass and appeared to have a direct
relationship with the logarithm of oxygen ion activity. Also it was found that in
commercial glasses containing low amounts of MgO, BaO and B20 3 the equilibrium pH
appeared to increase linearly with the increasing amount of alkali extraction when the
ratio of (moles of alkali oxides-moles of Al20 3) to moles of alkaline earth oxides is
more than 1.1. The slope of the plot of log alkali extraction against equilibrium pH
was found to be different for different systems. |
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