How to find the enthalpy-concentration diagram for the hydrogen chloride-water system
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I would like to ask how to find the enthalpy-concentration diagram for a hydrogen chloride-water system. For example, when it comes to the specific enthalpy of 30% hydrochloric acid at 40 degrees Celsius, should the value be taken from the upper part of the diagram or from the lower part? Under what circumstances should the lower value be used, and under what circumstances should the upper value be used?
It is the figure on pages 171-172 of the Handbook of Physicochemical Constants for Chlor-alkali Processes