log(S_o/S) = K_sC_s

where, S_o is the solubility of naphthalene in water (mol/L); S is the solubility of naphthalene in solution (mol/L); K_s is the Setschenow constant (L/mol); C_s is the concentration of sodium chloride (mol/L)

evaluating the equation for S over the range of C_s 0-2 mol/L, log S_o = –3.590 ± 0.004 (95% confidence limit) and K_s = 0.220 ± 0.0041 (95% confidence limit).

The corresponding mass percent and mole fraction, x₁ at salinity = 35 g(2)/kg sln calculated by the compilers are 2.36 × 10^–3 g(1)/100 g sln and 3.48 × 10^–6 assuming a solution density of 1.025 kg/L.

Experimental Data:   (Notes on the Nomenclature)
   Method/Apparatus/Procedure:
   Saturated solutions were prepared by equilibrating excess (1) in salt water in sealed ampols for 24 hrs. After filtration the absorbance was measured with a UV spectrophotometer at three wavelengths.

Source and Purity of Materials:
   (1) recrystallized four times and sublimed or zone refined, 99.99+% pure,
   (2) analytical reagent grade,
   (3) distilled from potassium permanganate and redistilled from all glass still.

Estimated Errors:
   Solubility: see above.
   Temperature: ± 0.03°C