Principles of Chemical Geology a Review of the Application of the Equilibrium T
Principles of Chemical Geology a Review of the Application of the Equilibrium T
James Vincent Elsden
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D. K. Akad. D. Wiss. , p. 570, 1900. VAPOUR PRESSURE 85 form of anhydrite as is got by heating gypsum in dry air. At a still higher temperature namely, 525 C. This soluble anhydrite passes into the insoluble form of natural anhydrite. Calcium sulphate in solu- tion in water, therefore, cannot be deposited as anhy- drite unless the vapour pressure of the gypsum exceeds that of the solution in contact with it. To secure this result, either the vapour pressure of the gypsum must be increased by ra...ising the temperature or the vapour pressure of the solution must be reduced, since at all temperatures below 107 C. The hydrate has a lower vapour pressure than pure water. In the natural formation of anhydrite, however, we are not dealing with a simple solution, but with a complex solution of soluble salts. We have to consider, therefore, the influence of co-solutes. The presence of any substance in solution which lowers the vapour tension of water will lower the inversion temperature of gypsum.
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