Components:
(1) Magnesium formate,
Mg(CHO2)2; [557-39-1]
NIST WebBook
(2) Sodium hydroxide,
NaOH; [1310-73-2]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Gyunner, E. A.; Melnichenko, N. D.; Yakhkind, N. D.; Velmozhnii, I. S.; Katseva, G. N.; Zh. Neorg. Khim. 24, 2172-2175 (1979).
Variables:
Ambient temperature: Composition at 20 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The system is studied by the method of physico-chemical analysis. After attaining the equilibrium, the residue concentrations of Mg2+ and OH- are measured and also diffraction coefficient (n) of the liquid phases. The methods of measurements are according to Ref. 1.
Source and Purity of Materials:
- The magnesium formate is obtained from magnesium carbonate and formic acid. The obtained product is twice recrystallized.
Estimated Errors:
Ambient temperature: t = ±0.05°C.
References
1 Gyunner, E. A.; Melnichenko, N. D.; Yakhkind, N. D.; Bobrishev, G. N.; Katseva, G. N.; Zh. Neorg. Khim. 23, 711 (1978).
Experimental Values:
Ratio OH-:Mg2+ in the liquid phase in the Mg(CHO2)2-NaOH-H2O system at 20°C.
| 100x2 | 100x1 | Phase (s) |
|---|---|---|
| 10.0 | 1.98 | Mg(OH)2 |
| 15.0 | 1.97 | Mg(OH)2 |
| 20.0 | 1.99 | Mg(OH)2 |
| 25.0 | 1.98 | Mg(OH)2 |
| 30.0 | 1.99 | Mg(OH)2 |
| 33.3 | 1.98 | Mg(OH)2 |
| 40.0 | 2.0 | Mg(OH)2 |
| 45.0 | 1.98 | Mg(OH)2 |
| 50.0 | 2.01 | Mg(OH)2 |
| 55.0 | 2.01 | Mg(OH)2 |
| 60.0 | 1.96 | Mg(OH)2 |
| 62.5 | - | Mg(OH)2 |
| 65.0 | - | Mg(OH)2 |
| 66.7 | 1.99 | Mg(OH)2 |
| 70.0 | 2.01 | Mg(OH)2 |
| 75.0 | 2.01 | Mg(OH)2 |
| 80.0 | 1.97 | Mg(OH)2 |
| 85.0 | 2.02 | Mg(OH)2 |
| 90.0 | 2.02 | Mg(OH)2 |
