= C. L. De Ligny
{c}
\b[C. L. De Ligny] is listed with <H. D. Nelson> as an author of 1968 measurements of hydrocarbon <solubility> in <water>. The IUPAC-NIST record for the <hexane>/<water> system names this publication as its original experimental source and records temperature-dependent measurements. It does not identify which coauthor performed each laboratory operation.<Hexane with water in the IUPAC-NIST Solubility Database>[Record37_269, Original Measurements and Variables]{ref}
This work is relevant to the quantitative meaning of <liquid immiscibility>. A bulk system can contain separate liquid regions while its aqueous phase still contains a small, measurable amount of hydrocarbon. Equilibrium composition and the total quantity recovered from an aliquot answer different questions.
For an original calculation, suppose a homogeneous solution has hydrocarbon <mole fraction> $x=3\times10^{-6}$ and total <amount of substance> $n=1\,\mathrm{mol}$. It contains $xn=3\,\mu\mathrm{mol}$ hydrocarbon. A representative aliquot containing $0.1\,\mathrm{mol}$ of the solution contains $0.3\,\mu\mathrm{mol}$ hydrocarbon while retaining the same mole fraction. These chosen values do not reconstruct the NIST table.
The database describes microsyringe sampling and <gas chromatography> with flame-ionization detection, connecting the small dissolved amount to a measurement procedure.<Hexane with water in the IUPAC-NIST Solubility Database>[Method/Apparatus/Procedure]{ref} Sample size, composition and instrument response must be distinguished before comparing solubility measurements.
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