Compilation - Cadmium formate with Water (IUPAC SDS Volume 73)
SDS Volume (4784)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Ashton, F. W.; Houston, D. F.; Saylor, C. P.; J. Res. Natl. Bur. Stan. 11, 233-53 (1933).
Variables:
Room Temp: 0 - 100 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Samples were taken at 6 and 18 h, filtered into weighing bottles and weighed. They were then evaporated in an oven at 125 °C, cooled in a desiccator and reweighed. From the weight of anhydrous salt the solubility in g/100g $\ce{H2O}$ was calculated.
Source and Purity of Materials:
- An aqueous solution of commercial cadmium formate was heated on a steam bath. A precipitate, which contained iron, was filtered off, and the salt was recrystallized twice from a weak formic acid solution. It was dried at 105°C and stored in a desiccator. The dihydrate was then prepared by recrystallization at room temperature from a 1% formic acid solution. The anhydrous salt was obtained by another recrystallization at 70-75°C.
Estimated Errors:
Mass concentration (m/v) (1): ±0.1 g/100 g H2O.
Components:
- Cadmium formate, $\ce{ Cd(CHO2)2 }$; [4464-23-7] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility of cadmium formate in water
| $T$ (°C) | 100w1 | g1/100 g H2O | m1 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 0 | 7.8 | 8.4 | 0.42 | A |
| 10 | 9.99 | 11.1 | 0.548 | A |
| 20 | 12.6 | 14.4 | 0.711 | A |
| 30 | 15.7 | 18.6 | 0.919 | A |
| 40 | 20.3 | 25.4 | 1.26 | A |
| 50 | 27.8 | 38.5 | 1.90 | A |
| 60 | 37.3 | 59.5 | 2.94 | A |
| 66 | 43.0 | 75.5 | 3.73 | A |
| 70 | 43.5 | 77.0 | 3.80 | B |
| 80 | 44.6 | 80.5 | 3.98 | B |
| 90 | 46.0 | 85.2 | 4.21 | B |
| 100 | 48.6 | 94.6 | 4.67 | B |
(a) The solid phases are: A = Cd(CHO2)2·2H2O; B = Cd(CHO2)2.
(b) The molality values were calculated by the compilers.
