IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Toluene with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Toluene; C7H8; [108-88-3]  NIST Chemistry WebBook for detail

Original Measurements:
   Bohon, R.L.; Claussen, W.F., J. Am. Chem. Soc. 1951, 73, 1571-8.

Variables:
   Temperature = 0.4-45.3 °C

Prepared By:
   G.T. Hefter

Experimental Data:   (Notes on the Nomenclature)

Solubility of Toluene in water
t/°C	g₁/100 g solution (compiler)	10⁴ * Mole Fraction x₁ (compiler)
0.4	0.0658	1.29
3.6	0.0646	1.26
10.0	0.0628	1.23
11.2	0.0624	1.22
14.9	0.0623	1.22
15.9	0.0621	1.21
25.0	0.0627	b	1.23	b
25.6	0.0625	1.22
30.0	0.0640	1.25
30.2	0.0642	1.25
35.2	0.0657	1.28
42.8	0.0701	1.37
45.3	0.0717	1.40

Notes:
   Table 1  ^a  Solubilities of (1) in (2) were reported as "optical density" (absorbance) measurements. Solubilities were calculated by the compiler using the Beer-Lambert law, the stated cell path-length (1 cm) and the authors' "extinction coefficients" (absorptivities) and corrected optical densities. This gave a solubility of g(1)/L sln which was then converted to g(1)/100g sln by assuming a solution density of 1.00 kg/L.
   Table 1  ^b  Given in the original paper as 0.627 g(1)/L sln.

Method/Apparatus/Procedure:
   A round-bottomed flask containing about 4 mL of (1) and 400 mL of 92) was evacuated, suspended in a thermostat, shaken for 24h and then allowed to settle for at least another 24h. Next, desired quantities of the water layer were syphoned into 6 glass-stoppered Erlenmeyer flasks. These 6 flasks had previously been tared, partially filled with a suitable amount of diluent water, and reweighed. Weighed portions of the samples were inserted into a quartz cuvette and measured in a Beckman DU spectrophotometer. Absorbances were corrected for adsorption of (1) onto the walls of the cuvette.

Source and Purity of Materials:
   (1) Phillips Petroleum Co., 99+%, used as received.
   (2) Air-free conductivity water, no further details given.

Estimated Errors:
   Solubility: ± 0.5 % relative
   Temperature: ± 0.02°C