SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Vasileva, V.; Cryst. Res. Technol. 31, 993-1000 (1996).
Conditions:
Room Temp: Composition at 25 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The solubility was studied by the KHLOPIN method for isothermal decrease of supersaturation. Equilibrium was reached in about 15-20 h. The concentration of $\ce{Fe^{2+}}$, $\ce{Cd^{2+}}$ was determined by an atomic absorption method. The solid phase composition was calculated by the variant of Schreinemakers method for algebraic indirect identification of the solid-phase composition [1]. X-ray powder diffraction analysis was also used.
Sample Information:
- The formates of iron(II) and cadmium were prepared by dissolving iron powder and cadmium carbonate, respectively, in diluted(1:1) formic acid at 70-80°C. The reagents used were p.a. grade.
Measurement Errors:
Ambient temperature: Not given.
Mass concentration (m/v) (1): The solubility was determined in a slight excess of formic acid (2 mass%), to suppress salt hydrolysis and to prevent Fe2+ oxidation.
Methodology Citation
1 Trendafelov, D.; Balarew, Chr.; Comm. Dept. Chem. Bulg. Acad. Sci. 1 , 73 (1968).
System Components:
- Iron(II) formate, $\ce{ Fe(CHO2)2 }$; [3047-59-4] NIST WebBook
- Cadmium formate, $\ce{ Cd(CHO2)2 }$; [4464-23-7] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w1 | 100w2 | D2|1 | D1|2 | m1 (mol/kg) a | m2 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|---|---|
| 4.20 | 0.00 | - | - | 0.300 | 0.000 | A |
| 3.54 | 1.72 | 0.43 | 2.33 | 0.256 | 0.089 | B |
| 3.25 | 2.48 | 0.46 | 2.17 | 0.236 | 0.129 | B |
| 2.89 | 3.42 | 0.44 | 2.27 | 0.211 | 0.180 | B |
| 2.36 | 4.39 | 0.46 | 2.17 | 0.173 | 0.232 | B |
| 2.17 | 5.85 | 0.43 | 2.33 | 0.161 | 0.314 | B |
| 1.89 | 7.03 | 0.47 | 2.13 | 0.142 | 0.381 | B |
| 1.40 | 8.33 | 0.46 | 2.17 | 0.106 | 0.455 | B |
| 1.06 | 9.49 | 0.47 | 2.13 | 0.081 | 0.521 | B |
| 0.00 | 12.45 | - | - | 0.000 | 0.702 | C |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Fe(CHO2)2·2H2O; B = (Fe,Cd)(CHO2)2·2H2O; C = Cd(CHO2)2·2H2O.
