SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Stoilova, D.; Balarew, C.; Vassileva, V.; Russeva, St.; Zh. Neorg. Khim. 26, 1641 (1981).
Conditions:
Room Temp: Composition at 80 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
Equilibrium was reached in 15-20 hrs using the isothermal decrease of supersaturation method. The sum of the $\ce{Mg^{2+}}$ and $\ce{Co^{2+}}$ content of both phases was determined using Complexon III at pH 9-10 and Eriochrome Black T as indicator. $\ce{Co^{2+}}$ was determined using Complexon III at pH 5.5-6.0 with Xylenol Orange as indicator. The composition of the suction-dried mixed crystals was determined by the method of algebraic indirect identification of the solid phase [1].
Sample Information:
- The cobalt and magnesium formates were prepared by reaction of the basic carbonates with formic acid solutions.
Measurement Errors:
Ambient temperature: Not given.
Mass concentration (m/v) (1): The solubilties were determined in a slight excess of formic acid.
Methodology Citation
1 Trendafelov, D.; Balarew, Chr.; Comm. Dept. Chem. Bulg. Acad. Sci. 1 , 73 (1968).
System Components:
- Magnesium formate, $\ce{ Mg(CHO2)2 }$; [557-39-1] NIST WebBook
- Cobalt formate, $\ce{ Co(CHO2)2 }$; [544-18-3] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w2 | 100w1 | D1|2 | D2|1 | m2 (mol/kg) a | m1 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|---|---|
| 4.28 | 0.00 | - | - | 0.300 | 0.00 | A |
| 2.48 | 2.93 | 0.06 | 16.67 | 0.176 | 0.271 | B |
| 1.69 | 5.14 | 0.06 | 16.67 | 0.122 | 0.482 | B |
| 1.47 | 7.14 | 0.08 | 12.50 | 0.108 | 0.683 | B |
| 0.94 | 10.27 | 0.07 | 14.29 | 0.071 | 1.012 | B |
| 0.63 | 11.13 | 0.06 | 16.67 | 0.048 | 1.103 | B |
| 0.38 | 14.11 | 0.08 | 12.50 | 0.030 | 1.443 | B |
| 0.00 | 16.52 | - | - | 0.00 | 1.731 | C |
(a) These values were calculated by the compilers.
(b) The solid phases are: A = Co(CHO2)2·2H2O; B = (Co,Mg)(CHO2)2·2H2O; C = Mg(CHO2)2·2H2O.
