Apparent molar properties of near-critical aqueous NaCl solutions have been reported to show very large anomalies. We show that these anomalies are to be expected in any dilute solution of a nonvolatile in a near-critical solvent. Debye-Hückel effects need to be handled with some care; if inserted in the Helmholtz free energy, they cause no more than a higher-order effect.
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Sengers et al. (1986) studied this question.
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