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 $\ce{Zn^{2+}}$ and $\ce{Cd^{2+}}$ 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 zinc and cadmium were prepared by dissolving of zinc hydroxide carbonate 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 salts hydrolysis.
Methodology Citation
1 Trendafelov, D.; Balarew, Chr.; Comm. Dept. Chem. Bulg. Acad. Sci. 1 , 73 (1968).
System Components:
- Zinc formate, $\ce{ Zn(CHO2)2 }$; [557-41-5] 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 | m2 (mol/kg) a | m1 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|---|---|
| 5.38 | 0.00 | - | - | 0.365 | 0.00 | A |
| 4.71 | 1.89 | 0.48 | 2.08 | 0.324 | 0.099 | B |
| 4.50 | 2.53 | 0.51 | 1.96 | 0.311 | 0.134 | B |
| 4.04 | 3.35 | 0.46 | 2.17 | 0.280 | 0.178 | B |
| 3.85 | 3.90 | 0.49 | 2.04 | 0.268 | 0.208 | B |
| 3.64 | 4.78 | 0.50 | 2.00 | 0.255 | 0.257 | B |
| 3.20 | 6.29 | 0.47 | 2.13 | 0.227 | 0.343 | B |
| 3.28 | 6.35 | 0.233 | 0.347 | Eutonic | ||
| 2.62 | 7.19 | 0.63 | 1.59 | 0.186 | 0.393 | C |
| 2.21 | 7.77 | 0.66 | 1.52 | 0.157 | 0.426 | C |
| 1.86 | 8.44 | 0.69 | 1.45 | 0.133 | 0.464 | C |
| 1.48 | 9.16 | 0.73 | 1.37 | 0.106 | 0.506 | C |
| 1.02 | 10.33 | 0.86 | 1.16 | 0.074 | 0.575 | C |
| 0.00 | 12.45 | - | - | 0.00 | 0.702 | D |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Zn(CHO2)2·2H2O; B = (Zn,Cd)(CHO2)2·2H2O; C = (Cd,Zn)(CHO2)2·2H2O; D = Cd(CHO2)2·2H2O.
