IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Acetonitrile with Water
Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Acetonitrile; C2H3N; [75-05-8]  NIST Chemistry WebBook for detail
Original Measurements:
   Szydlowski, J.; Szykula, M., Fluid Phase Equilib. 154, 79 (1999).

 Variables:
   Temperature = 260 K to 272 K

 Prepared By:
   Valerii P. Sazonov

 Experimental Data:   (Notes on the Nomenclature)
  
Mutual solubility of acetonitrile (1) and water (2)
t/°CT/K102 * Mass Fraction w1 (compiler) Mole Fraction x1Comment(s)
-13.181259.969--Water-rich phase
-10.007263.14331.80.170Water-rich phase
-9.225263.925--Water-rich phase
-5.763267.38736.40.201Water-rich phase
-5.763267.387--Water-rich phase
-3.785269.365--Water-rich phase
-2.631270.51943.20.250Water-rich phase
-2.226270.924--Water-rich phase
-1.919271.23146.20.274Water-rich phase
-1.717271.433--Water-rich phase
-1.539271.61149.50.301Water-rich phase
-1.418271.732--Water-rich phase
-1.384271.76652.40.326Water-rich phase
-1.372271.778--Water-rich phase
-1.348271.80255.00.349Water-rich phase
-1.338271.812--Water-rich phase
-1.338271.81256.70.365Water-rich phase
-13.181259.96984.20.700Acetonitrile-rich phase
-10.007263.143--Acetonitrile-rich phase
-9.225263.92580.90.650Acetonitrile-rich phase
-5.763267.387--Acetonitrile-rich phase
-5.763267.38777.00.595Acetonitrile-rich phase
-3.785269.36573.60.550Acetonitrile-rich phase
-2.631270.519--Acetonitrile-rich phase
-2.226270.92469.30.498Acetonitrile-rich phase
-1.919271.231--Acetonitrile-rich phase
-1.717271.43366.00.460Acetonitrile-rich phase
-1.539271.611--Acetonitrile-rich phase
-1.418271.73263.00.428Acetonitrile-rich phase
-1.384271.766--Acetonitrile-rich phase
-1.372271.77860.50.402Acetonitrile-rich phase
-1.348271.802--Acetonitrile-rich phase
-1.338271.81257.70.375Acetonitrile-rich phase
-1.338271.81256.7  (UCST)0.365Acetonitrile-rich phase
 Method/Apparatus/Procedure:
   The synthetic method was used with a simplified version of the apparatus described in Ref. 1. Temperature was changed at the rate < 0.01 K/min; there was no visible influence of the rate on the transition temperature up to the rate 0.1 K/min. Due to the very weak turbidity a long capillary cell was employed. A 5-mW Polythec HeNe laser was used as a probe for detecting the phase separation.

 Source and Purity of Materials:
   (1) Byk-Malinckrodt; AR; carefully purified by the column distillation; purity of the collected fractions at least 99.95 mass %.
   (2) Millipore Mili-Q; quality.

 Estimated Errors:

   Temperature: ± 5 mK

 References:
   1. J. Szydlowski, L. P. Rebelo, and W. A. Van Hook, Rev. Sci. Instrum. 63, 1717 (1992).