Compilation - Sodium formate with Sodium iodide (IUPAC SDS Volume 73)
SDS Volume (4759)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Leonesi, D.; Braghetti, M.; Cingolani, A.; Franzosini, P.; Z. Naturforsch. A 25, 52-5 (1970).
Variables:
Prepared by:
Method/Apparatus/Procedure:
A Pyrex device, suitable for work under an inert atmosphere, and allowing one to observe the system visually, was used [1]. The initial crystallization temperatures were measured with a Chromel-Alumel thermocouple checked by comparison with a certified $\ce{Pt}$ resistance thermometer, and connected to a L&N Type K-3 potentiometer.
Source and Purity of Materials:
- C. Erba RP materials, dried by heating under vacuum, were used.
Estimated Errors:
Ambient temperature: The compiler estimates the accuracy of the temperature measurements to be probably ±0.1 K.
Mass concentration (m/v) (1): No information is given.
References
1 Braghetti, M.; Leonesi, D.; Franzosini, P.; Ric. Sci. 38, 116 (1968).
Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
- Sodium iodide, $\ce{ NaI }$; [7681-82-5] NIST WebBook
Experimental Data
Note 1: In the original paper the results were shown in graphical form. The numerical values listed above were given in a personal communication from one of the authors (F.P.) to the compiler.
Note 2: The system could not be investigated above about 300°C due to the thermal instability of the formate.
Note 3: There is a eutectic at 227.7°C and 100 x2 = 17.25.
Melting temperatures for different mole fractions
| $T_{\rm{m}}$ ($\pu{K}$) | $T_{\rm{m}}$ (°C) | $100 x_{2}$ |
|---|---|---|
| 530.7 | 257.5 | 0 |
| 530.0 | 256.8 | 0.42 |
| 529.5 | 256.3 | 0.73 |
| 529.1 | 255.9 | 0.98 |
| 528.6 | 255.4 | 1.34 |
| 527.9 | 254.7 | 1.79 |
| 527.5 | 254.3 | 2.03 |
| 524.4 | 251.2 | 4.02 |
| 521.5 | 248.3 | 6.00 |
| 518.1 | 244.9 | 7.99 |
| 516.7 | 243.5 | 9.00 |
| 514.8 | 241.6 | 9.98 |
| 510.9 | 237.7 | 12.01 |
| 507.2 | 234.0 | 13.99 |
| 505.4 | 232.2 | 15.00 |
| 503.2 | 230.0 | 15.99 |
| 509.7 | 236.5 | 17.99 |
| 521.6 | 248.4 | 18.98 |
| 544.1 | 270.9 | 20.99 |
| 579.5 | 306.3 | 24.61 |
(a) The T/K values were calculated the compiler.
