SDS Volume (4711)
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 in a medium containing at least 50% acetone. Formic acid was determined by acidimetry. Acetone was determined spectrophotometrically using $\lambda = \pu{275 nm}$. The solid phase was determined by thermogravimetry.
Source and Purity of Materials:
- Commercial $\ce{NaCHO2}$ was dehydrated and dried at 413.2 K for 48 hrs. Formic acid was purified by the method of Wehman and Popov [1]. Purity: 99.9 ±0.2%. Commercial acetone was purified by drying with anhydrous $\ce{CaSO4}$ [2]. It contained 0.03% ±0.01% water.
Estimated Errors:
Ambient temperature: The temperature was controlled to within ±0.05°C. Nothing else was specified.
References
1
Wehman, T. C.; Popov, A. I.; J. Phys. Chem. 72, 4031 (1968).
2
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
- Formic acid, $\ce{ CH2O2 }$; [64-18-6] NIST WebBook
- Acetone, $\ce{ C3H6O }$; [67-64-1] NIST WebBook
Experimental Data
Solubility values in the NaCHO2-CH2O2-C3H6O system at 25°C.
| 100w1 | 100w2 | 100w3 | $100 x_{1}$ | $100 x_{2}$ | $100 x_{3}$ | Phase (s) () |
|---|---|---|---|---|---|---|
| 32.5 | 66.9 | 0.6 | 24.6 | 74.9 | 0.5 | A |
| 30.5 | 62.8 | 6.7 | 23.3 | 70.8 | 6.0 | A |
| 28.0 | 59.6 | 12.4 | 21.4 | 67.4 | 11.1 | A |
| 19.5 | 48.0 | 32.5 | 15.2 | 55.2 | 29.6 | A |
| 15.3 | 40.2 | 44.5 | 12.1 | 46.8 | 41.1 | A |
| 13.0 | 37.6 | 49.4 | 10.3 | 44.0 | 45.8 | A |
| 7.07 | 27.5 | 65.4 | 5.69 | 32.7 | 61.6 | A + B |
| 6.51 | 25.8 | 67.7 | 5.25 | 30.8 | 64.0 | B |
| 6.28 | 23.2 | 70.5 | 5.10 | 27.8 | 67.1 | B |
| 4.04 | 17.3 | 78.7 | 3.32 | 21.0 | 75.7 | B |
| 2.59 | 13.4 | 84.0 | 2.14 | 16.4 | 81.5 | B |
| 1.00 | 7.15 | 91.85 | 0.84 | 8.87 | 90.29 | B |
| 0.17 | 3.02 | 96.81 | 0.14 | 3.78 | 96.08 | B |
| 0.23 | 2.50 | 97.27 | 0.20 | 3.13 | 96.67 | B + C |
| 0.23 | 2.15 | 97.62 | 0.20 | 2.70 | 97.10 | C |
| 0.23 | 0.87 | 98.9 | 0.20 | 1.1 | 98.7 | C |
| 1.4 x 10-4 | 0.0 | 1E+2 | 1.2 x 10-4 | 0.0 | 1E+2 | C |
(a) These values were calculated by the compiler.
(b) The solid phases are: A = NaCHO2·CH2O2; B = 3NaCHO2·CH2O2; C = NaCHO2.
