IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Naphthalene with Sodium chloride and Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Naphthalene; C10H8; [91-20-3]  NIST Chemistry WebBook for detail
   (3) Sodium chloride; NaCl; [7647-14-5]  NIST Chemistry WebBook for detail
Original Measurements:
   Schwarz, F.P., J. Chem. Eng. Data. 1977, 22, 273-7.

 Variables:
   Temperature = 8.6 °C - 31.8 °C   
pH = Salnity: 30 g(2)/kg sln
   Concentration = Salnity: 30 g(2)/kg sln

 Prepared By:
   W.Y. Shiu and D. Mackay

 Experimental Remarks:
   The corresponding mass percent and mole fraction x1, at 25.0°C calculated by the compilers are 2.17 × 10-3 g(1)/100 g sln and 3.13 × 10-6.

 Experimental Data:   (Notes on the Nomenclature)
  
t/°C104 * n1/V2 [mol/L]Comment(s)
8.60.84Solubility of naphthalene in 0.5 g-mol(2)/dm3
11.10.92Solubility of naphthalene in 0.5 g-mol(2)/dm3
14.01.09Solubility of naphthalene in 0.5 g-mol(2)/dm3
17.11.23Solubility of naphthalene in 0.5 g-mol(2)/dm3
20.01.37Solubility of naphthalene in 0.5 g-mol(2)/dm3
23.01.58Solubility of naphthalene in 0.5 g-mol(2)/dm3
25.01.73Solubility of naphthalene in 0.5 g-mol(2)/dm3
31.82.22Solubility of naphthalene in 0.5 g-mol(2)/dm3
 Method/Apparatus/Procedure:
   The solubility of naphthalene in NaCl solution was determined by fluorescence and UV absorption measurements. In the fluorescence method, saturated solution was prepared by ading excess amount of naphthalene to an air-tight 1x1 cm quarts fluorescence cell containing 5 mL salt solution. The cell was rotated at 20 rpm for at least 72 hr in a thermostatted water bath and then its fluorescent intensity was measured at 350 and 315 nm. The Spectrofluorimeter employed a ratio-photon counting mode where naphthalene concentration was linearly related to the fluorescence signal. The UV method was used to obtain the absorptivity of naphthalene in ethanol therefore provide an absolute solubility scale for the fluorescence method.

 Source and Purity of Materials:
   Naphthalene: purity > 99 mole %
Sodium chloride: reagent grade
Ethanol: reagent grade
Water: distilled over a KMnO4- NaOH solution and passed through a Sephadex column.

 Estimated Errors:
   Solubility: ± 3.3%
   Temperature: ± 0.1°C