SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Itkina, L. S.; Nadzharyan, K. A.; Zh. Neorg. Khim. 26, 515 (1981).
Conditions:
Room Temp: Composition at 25 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The isothermal method was used. Equilibrium was reached in 3 weeks. The sodium content of both phases was determined by flame photometry. The $\ce{Cd^{2+}}$ content was determined complexometrically using Eriochrome Black T as the indicator. The composition of the solid phases was determined by Schreinemakers' method, by TG analysis, IR spectroscopy and X-ray diffraction.
Sample Information:
- $\ce{NaCHO2}$ and $\ce{Cd(CHO2)2.2H2O}$ were prepared by reacting formic acid with PA grade $\ce{NaOH}$ and $\ce{CdCO3}$, respectively. The sodium formate synthesis was carried out in an alkaline medium to prevent formation of the acid salt.
Measurement Errors:
Ambient temperature: The temperature was kept constant to within ±0.1°C.
System Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] 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 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 43.99 | - | 11.55 | - | A |
| 46.89 | 1.15 | 13.29 | 0.109 | A + B |
| 43.16 | 1.18 | 11.40 | 0.105 | B |
| 38.46 | 1.23 | 9.375 | 0.101 | B |
| 31.94 | 1.32 | 7.036 | 0.098 | B |
| 24.41 | 1.94 | 4.873 | 0.130 | B |
| 16.73 | 4.78 | 3.134 | 0.301 | B |
| 10.30 | 8.78 | 1.871 | 0.536 | B |
| 9.11 | 10.07 | 1.66 | 0.615 | B + C |
| 4.69 | 11.16 | 0.819 | 0.655 | C |
| - | 14.10 | - | 0.811 | C |
(a) The solid phases are: A = NaCHO2; B = NaCd(CHO2)3; C = Cd(CHO2)2·2H2O.
(b) The molality values were calculated by the compilers.
