Compilation - Sodium formate with Sodium acetate (IUPAC SDS Volume 73)
SDS Volume (4743)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Sokolov, N. M.; Zh. Obshch. Khim. 24, 1581-93 (1954).
Variables:
Prepared by:
Method/Apparatus/Procedure:
A visual polythermal method was used. The melts were contained in glass tubes and stirred. The temperatures were measured with a Nichrome-Constantan thermocouple and a 17 mV full scale millivoltmeter. The temperature readings refer to the disappearance of isotropicity in the melt on cooling.
Source and Purity of Materials:
- Component (1) was prepared by reacting aqueous "chemically pure" sodium carbonate with a slight excess of analytical grade formic acid.
Component (2) was "chemically pure" material.
Estimated Errors:
Ambient temperature: The compiler estimates the accuracy of the temperature measurements to be probably ±2 K.
Mass concentration (m/v) (1): No information is given.
Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
- Sodium acetate, $\ce{ NaC2H3O2 }$; [127-09-3] NIST WebBook
Experimental Data
Note: There is a eutectic at 242°C and 100 x2 = 10.5.
Melting temperatures for different mole fractions
| $T_{\rm{m}}$ ($\pu{K}$) | $T_{\rm{m}}$ (°C) | $100 x_{2}$ |
|---|---|---|
| 531 | 258 | 0 |
| 525 | 252 | 5 |
| 517 | 244 | 1E+1 |
| 515 | 242 | 10.5 |
| 525 | 252 | 15 |
| 533 | 260 | 2E+1 |
| 540 | 267 | 25 |
| 543 | 270 | 3E+1 |
| 551 | 278 | 35 |
| 557 | 284 | 4E+1 |
| 564 | 291 | 45 |
| 569 | 296 | 5E+1 |
| 573 | 300 | 55 |
| 576 | 303 | 6E+1 |
| 581 | 308 | 65 |
| 586 | 313 | 7E+1 |
| 589 | 316 | 75 |
| 593 | 320 | 8E+1 |
| 596 | 323 | 85 |
| 599 | 326 | 9E+1 |
| 603 | 330 | 95 |
| 604 | 331 | 1E+2 |
(a) The T/K values were calculated the compiler.
