SDS Volume (4656)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Stoilova, D.; Bulg. Chem. Commun. 25, 249-57 (1992).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The method used was the isothermal decrease of supersaturation. Equilibrium was reached in 10-15 h. The magnesium content was determined complexometrically. The chloride ion content was determined volumetrically by the Mohr method. The magnesium formate concentration was estimated by difference. The composition of the ideally suction-dried solid phase was determined by the Schreinemakers method. X-ray diffraction and DT analysis were also used.
Source and Purity of Materials:
- The magnesium chloride was p. a. grade (Merck). The magnesium formate was prepared by the reaction of dilute formic acid with magnesium oxide, carbonate or hydroxide all of which were p.a. grade (Merck or Fluka).
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
Components:
- Magnesium formate, $\ce{ Mg(CHO2)2 }$; [557-39-1] NIST WebBook
- Magnesium chloride, $\ce{ MgCl2 }$; [7786-30-3] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility values in the Mg(CHO2)2-MgCl2-H2O system at 25°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 11.96 | - | 1.188 | - | A |
| 10.17 | 4.08 | 1.037 | 0.500 | A |
| 7.17 | 10.26 | 0.759 | 1.305 | A |
| 5.45 | 16.21 | 0.608 | 2.173 | A |
| 4.62 | 21.75 | 0.549 | 3.102 | A |
| 4.10 | 26.21 | 0.514 | 3.949 | A |
| 4.65 | 34.53 | 0.669 | 5.962 | Eutonic |
| 4.56 | 34.07 | 0.650 | 5.830 | Eutonic |
| 3.53 | 34.53 | 0.498 | 5.854 | B |
| 1.18 | 35.12 | 0.162 | 5.790 | B |
| - | 35.65 | - | 5.818 | B |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Mg(CHO2)2·2H2O; B = MgCl2·6H2O.
