Compilation - Magnesium formate with Water (IUPAC SDS Volume 73)
SDS Volume (4627)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Ashton, F. W.; Houston, D. F.; Saylor, C. P.; J. Res. Natl. Bur. Stan. 11, 233-53 (1933).
Variables:
Room Temp: -5.05 - 100 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Samples were taken at 6 and 18 hours, filtered into weighing bottles and weighed. They were then evaporated to dryness and the residue ignited to MgO.The lower portion of the solubility curve and the eutectic were determined by freezing point measurements. These determinations were made in a Beckmann type apparatus with a thermometer graduated in 0.1 °C.
Source and Purity of Materials:
- Magnesium formate was prepared by adding basic magnesium carbonate to excess formic acid. It was recrystallized from an aqueous solution containing a small amount of formic acid to prevent formation of basic salts.
Estimated Errors:
Mass concentration (m/v) (1): ±0.25 g/100 g H2O.
Components:
- Magnesium formate, $\ce{ Mg(CHO2)2 }$; [557-39-1] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility of magnesium formate in water.
| $T$ (°C) | 100w1 | g1/100 g H2O | m1 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| -5.05 | 12.3 | 14.0 | 1.22 | A + B |
| 0 | 12.3 | 14.0 | 1.22 | A |
| 10 | 12.4 | 14.1 | 1.23 | A |
| 20 | 12.6 | 14.4 | 1.26 | A |
| 30 | 13.0 | 15.0 | 1.31 | A |
| 40 | 13.7 | 15.9 | 1.39 | A |
| 50 | 14.4 | 16.8 | 1.47 | A |
| 60 | 15.3 | 18.0 | 1.57 | A |
| 70 | 16.1 | 19.2 | 1.68 | A |
| 80 | 17.1 | 20.6 | 1.80 | A |
| 90 | 18.2 | 22.2 | 1.94 | A |
| 100 | 19.4 | 24.0 | 2.10 | A |
(b) The solid phases are: A = Mg(CHO2)2·2H2O; B = ice.
(a) The molality values were calculated by the compilers.
