IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Naphthalene with Methanol

Components:
   (1) Methanol; CH4O; [67-56-1]  NIST Chemistry WebBook for detail
   (2) Naphthalene; C10H8; [91-20-3]  NIST Chemistry WebBook for detail

Original Measurements:
   Ward, H.L., J. Phys. Chem. 1926, 30, 1316-1333.

Variables:
   Temperature = Temperature

Prepared By:
   W.E. Acree, Jr.

Experimental Data:   (Notes on the Nomenclature)


T/K	Mole Fraction x₁	Mole Fraction x₂
274.0	0.0107	0.989
286.7	0.0163	0.984
299.5	0.0255	0.974
306.8	0.0333	0.967
310.6	0.0390	0.961
317.1	0.052	0.948
329.9	0.102	0.898
334.0	0.143	0.857
338.9	0.255	0.745
341.6	0.387	0.613
342.7	0.497	0.503
344.9	0.666	0.334
346.0	0.732	0.268
347.1	0.794	0.206
347.5	0.820	0.180

Method/Apparatus/Procedure:
   Constant temperature bath and a precision thermometer.
Solubilities were measured using a dynamic method. Mixtures of known concentrations were sealed in thick-walled glass tubes and placed in a constant temperature to equilibrate with gentle rotation to thoroughly mix contents. Bath temperature was slowly increased and solubility visually determined by visually noting the temperature at which the last trace of solid solute disappeared. Measurements repeated several times to verify results.

Source and Purity of Materials:
   (1) Purity and source not specified, was recrystallized several times from methanol to give a melting temperature of 80.05-80.10 ºC.
   (2) Absolute, commercial supplier not identified, fractionally distilled over sodium metal, collecting the fraction at 64.7-64.8 ºC.

Estimated Errors:

   Temperature: T/K: precision ± 0.1. x₁: to 3 significant figs. (compiler).