Components:
(1) Sodium formate,
NaCHO2; [141-53-7]
NIST WebBook
(2) Sodium isobutanoate,
NaC4H7O2; [996-30-5]
NIST WebBook
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 thermouple and a 17mV full scale millivoltmeter. The temperature readings refer to the disappearance of isotropicity in the melt on cooling.
Source and Purity of Materials:
- The materials were prepared by reacting aqueous "chemically pure" sodium carbonate with a slight excess of the analytical grade proper acid. The solvent and excess acid were removed by heating to 160°C.
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.
Experimental Values:
Note: Note: There are two eutectics: one at 252°C and 100x2 = 1.3; the other at 250°C and 100x2 = 96.5.Melting temperatures for different mole fractions
| Tm (K) | Tm (°C) | 100x2 |
|---|---|---|
| 531.0 | 258.0 | 0.0 |
| 525.0 | 252.0 | 1.3 |
| 563.0 | 290.0 | 5.0 |
| 578.0 | 305.0 | 10.0 |
| 587.0 | 314.0 | 15.0 |
| 592.0 | 319.0 | 20.0 |
| 594.0 | 321.0 | 25.0 |
| 597.0 | 324.0 | 30.0 |
| 599.0 | 326.0 | 35.0 |
| 600.0 | 327.0 | 40.0 |
| 602.0 | 329.0 | 45.0 |
| 603.0 | 330.0 | 50.0 |
| 602.0 | 329.0 | 55.0 |
| 600.0 | 327.0 | 60.0 |
| 598.0 | 325.0 | 65.0 |
| 593.0 | 320.0 | 70.0 |
| 587.0 | 314.0 | 75.0 |
| 579.0 | 306.0 | 80.0 |
| 569.0 | 296.0 | 85.0 |
| 555.0 | 282.0 | 90.0 |
| 531.0 | 258.0 | 95.0 |
| 523.0 | 250.0 | 96.5 |
| 533.0 | 260.0 | 100.0 |
(a) The T/K values were calculated the compiler.
