Heat capacities at constant volume and composition are reported for aqueous sodium sulfate for three compositions, 1 mass %, 5 mass %, and 10 mass %, respectively, and along 19 isochores, from 250 kg‚m -3 to 1073 kg‚m -3 in the temperature range from 350 K to 670 K. In the range from 630 K to 650 K, many of these isochores display two features in the heat capacity as a function of the temperature: one peak or step when solid salt first precipitates and, on further heating, a λ-shaped peak when the vapor-or liquid-phase disappears. In Part 2 of this paper, these features will be interpreted.
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