SDS Volume (4707)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Bianco, P.; Haladjian, J.; Lanza, E.; Asso, M.; Bull. Soc. Chim. Fr. 1253 (1971).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached within 24 hours. The sodium formate content was determined by potentiometric titration. Acetone and water were determined spectrophotometrically using $\lambda = \pu{275 nm}$ and $\lambda = \pu{1920 nm}$, respectively. The solid phase was identified with thermogravimetry.
Source and Purity of Materials:
- Commercial $\ce{NaCHO2}$ was dehydrated and dried at 413.2 K for 48 hrs. Commercial acetone was purified by drying with anhydrous $\ce{CaSO4}$ [1]. It contained 0.03% ±0.01% water. Freshly distilled water was used.
Estimated Errors:
Ambient temperature: The temperature was controlled to within ±0.05 K.
References
1 Weissberger; A.; Proskauer, E. S.; Techniques of Organic Chemistry, VII Organic Solvents, Interscience, New York, p. 293 (1955).
Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
- Acetone, $\ce{ C3H6O }$; [67-64-1] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Two immiscible solutions were observed: L1, water saturated with acetone, and, L2, acetone saturated with water.
Table 2. Solubility values in the NaCHO2-C3H6O-H2O system.
| 100w1 | 100w2 | 100w3 | $100 x_{1}$ | $100 x_{2}$ | $100 x_{3}$ | Phase (s) () | Phase (l) () |
|---|---|---|---|---|---|---|---|
| 48.8 | 0.0 | 51.2 | 20.2 | 0.0 | 79.8 | A + B | L2 |
| 48.9 | 2.98 | 48.1 | 20.2 | 1.49 | 77.6 | A + B | L2 |
| 35.5 | 5.50 | 59.1 | 13.4 | 2.43 | 81.2 | L1 + L2 + B | L2 |
| 27.2 | 10.8 | 62.0 | 9.93 | 4.62 | 85.5 | L1 + L2 | L2 |
| 24.0 | 13.2 | 62.8 | 8.68 | 5.59 | 85.7 | L1 + L2 | L2 |
| 19.6 | 16.7 | 63.7 | 7.01 | 7.00 | 87.0 | L1 + L2 | L2 |
| 17.4 | 19.5 | 63.1 | 6.25 | 8.17 | 85.9 | L1 + L2 | L2 |
| 11.5 | 29.5 | 59.1 | 4.27 | 12.8 | 82.9 | L1 + L2 | L2 |
| 10.0 | 34.0 | 56.0 | 3.83 | 15.2 | 80.9 | A | L2 |
(a) These values were calculated by the compilers.
(b) The phases are: A = liquid; B = NaCHO2.
