A CALORIMETRIC STUDY OF WATER-BEARING QUA RTZ GLASS AND ZEOLITE

Thermochemical investigations of water-bearing silicates were carried out by the technique of calorimetry of dissolution in aggressive media . The goal was to determine the enthalpy of the dissolution of water i n the form of molecular and hydroxyl species in silicate substances, a nd the effect of the composition on this quantity. The study yielded t he enthalpies of water dissolution in the molecular and the hydroxyl s pecies. It is shown that the dissolution of water in rhyolitic glass, with the formation of hydroxyl groups, follows the same scheme as in a lbitic glass, differing from the scheme of interaction with quartz gla ss.