Abstract
The activity data \( a_{{{\text{H}}_{ 2} {\text{O}}}} = {{p_{{{\text{H}}_{ 2} {\text{O}}}} } \mathord{\left/ {\vphantom {{p_{{{\text{H}}_{ 2} {\text{O}}}} } {p_{{{\text{H}}_{ 2} {\text{O}}}}^{0} }}} \right. \kern-0pt} {p_{{{\text{H}}_{ 2} {\text{O}}}}^{0} }} \) were plotted against the mole fractions \( x_{{{\text{H}}_{ 2} {\text{O}}}} \) of free water for HClO4–H2O solutions. It was found that \( a_{{{\text{H}}_{ 2} {\text{O}}}} = k{\cdot}x_{{{\text{H}}_{ 2} {\text{O}}}} \) where k = 1.00 ± 0.01.
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Karelin, A.I., Tarasenko, V.A. The Water Activity and Free Water Mole Fraction in Perchloric Acid. J Solution Chem 44, 146–151 (2015). https://doi.org/10.1007/s10953-014-0285-x
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DOI: https://doi.org/10.1007/s10953-014-0285-x