IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Acetonitrile-d3 with Water-d3

Components:
   (1) Water-d₂; D2O; [7789-20-0]  NIST Chemistry WebBook for detail
   (2) Acetonitrile-d₃; C2D3N; [2206-26-0]  NIST Chemistry WebBook for detail

Original Measurements:
   Szydlowski, J.; Szykula, M., Fluid Phase Equilib. 154, 79 (1999).

Variables:
   Temperature = 255 K to 279 K

Prepared By:
   Valerii P. Sazonov

Experimental Remarks:

   UCST was reported at 279.244 ± 0.006 K at x_1c = 0.360 ± 0.003 (100 w₁ = 55.3, compiler).

Experimental Data:   (Notes on the Nomenclature)

Mutual solubility of acetonitrile-d₃ (1) and water-d₂ (2)
t/°C	T/K	10² * Mass Fraction w₁ (compiler)	Mole Fraction x₁	Comment(s)
-18.515	254.635	-	-	Water-d2-rich phase
-9.774	263.376	-	-	Water-d2-rich phase
-6.481	266.669	28.0	0.150	Water-d2-rich phase
-5.531	267.619	-	-	Water-d2-rich phase
-1.591	271.559	-	-	Water-d2-rich phase
1.619	274.769	-	-	Water-d2-rich phase
2.036	275.186	35.6	0.201	Water-d2-rich phase
3.615	276.765	-	-	Water-d2-rich phase
5.027	278.177	-	-	Water-d2-rich phase
5.098	278.248	42.6	0.252	Water-d2-rich phase
5.728	278.878	-	-	Water-d2-rich phase
5.949	279.099	48.5	0.300	Water-d2-rich phase
6.095	279.245	54.1	0.349	Water-d2-rich phase
-18.515	254.635	90.0	0.804	Acetonitrile-d3-rich phase
-9.774	263.376	86.2	0.739	Acetonitrile-d3-rich phase
-6.481	266.669	-	-	Acetonitrile-d3-rich phase
-5.531	267.619	83.5	0.697	Acetonitrile-d3-rich phase
-1.591	271.559	80.3	0.649	Acetonitrile-d3-rich phase
1.619	274.769	76.4	0.595	Acetonitrile-d3-rich phase
2.036	275.186	-	-	Acetonitrile-d3-rich phase
3.615	276.765	72.8	0.549	Acetonitrile-d3-rich phase
5.027	278.177	68.4	0.496	Acetonitrile-d3-rich phase
5.098	278.248	-	-	Acetonitrile-d3-rich phase
5.728	278.878	64.6	0.453	Acetonitrile-d3-rich phase
5.949	279.099	-	-	Acetonitrile-d3-rich phase
6.095	279.245	-	-	Acetonitrile-d3-rich phase

Method/Apparatus/Procedure:
   The synthetic method was used with a simplified version of the apparatus described in work.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) Sigma; 99.5 % D; carefully dried over 5 Å molecular sieves; not purified.
   (2) From Institute of Atomic Energy, Isotope Distribution Center; 99.92 % D; twice distilled.

Estimated Errors:

   Temperature: ± 5 mK

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