Abstract
The state of water in calcium chloride and sodium sulfate solutions, as well as during the crystallization of calcium sulfate from solutions with concentrations of 0.68–7.08 g dm–3 was studied by the differential scanning calorimetry. One clearly detectable endothermic peak was revealed in the DSC curves of ice melting of CaCl2 and Na2SO4 solutions. An increase in the concentration of these solutions does not lead to the appearance of any additional peaks or “shoulders” on the DSC curves. Thermograms for sodium sulfate and calcium chloride mixed solutions change their patterns: a low-temperature peak appears and peaks with asymmetric shoulders or splitted principal peak are registered. These changes are presumably related to the water structuring by the surface of forming calcium sulfate crystals.
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