Components:
(1) Acetonitrile,
C2H3N; [75-05-8]
NIST WebBook
(2) Heptanedioic acid,
C7H12O4; [111-16-0]
NIST WebBook
Original Measurements
Smagowski, H.; Zesz. Nauk. Wydz. Mat., Fiz. Chem., Univ. Gdanski, Chem. 3, 45-53 (1974).
Variables:
Ambient temperature: 273 - 308 K
Prepared by:
Method/Apparatus/Procedure:
The titration method was used: 25 mL of (1) and an amount of (2) exceeding the solubility were placed in 50 mL volumetric flasks. The flasks were closed by ground glass stoppers and stored at the required temperature in a thermostat for 45 hours, with intensive stirring every several hours. After this, 5 mL samples of the saturated solution were taken by pipette, diluted to 25 mL with water and titrated against 0.1 N sodium hydroxide solutions by using phenolphthalein indicator.
Source and Purity of Materials:
- Source not specified; purity not specified; dried over anhydrous K2CO3 and repeatedly distilled over P2O5.
- Source not specified; purity not specified; purified by crystallization from ethyl acetate.
Estimated Errors:
Ambient temperature: Not reported.
Mass concentration (m/v) (1): Not reported.
References
1 Timmermans, J.; Physico-Chemical Constants of Pure Organic Compounds (Elsevier, New York, 1950).
Experimental Values:
Solubility of heptanedioic acid (2) in acetonitrile (1)
| T (°C) | T (K) | C1 (mol/L) | 100w2a | x2 |
|---|---|---|---|---|
| 0.0 | 273.2 | 1.5 x 10-2 | 3.0 x 10-1 | 8 x 10-4 |
| 15.0 | 288.2 | 3.2 x 10-2 | 6.5 x 10-1 | 1.7 x 10-3 |
| 25.0 | 298.2 | 5.5 x 10-2 | 1.1 | 2.8 x 10-3 |
| 35.0 | 308.2 | 1.2 x 10-1 | 2.4 | 6.3 x 10-3 |
(a) For these calculations the compiler assumed that the densities of the solutions were those of acetonitrile1 at the specified temperatures.
