SDS Volume (4650)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Portnova, S. M.; Krassilov, Yu. I.; Kuznetzov, N. T.; Balakaeva, I. V.; Zh. Neorg. Khim. 35, 237-41 (1990).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. One month was allowed for equilibration. The $\ce{Y^{3+}}$ and $\ce{Co^{2+}}$ contents were determined complexometrically using diethyldithiocarbamate [1]. The composition of the solid phases was determined by the Schreinemakers method.
Source and Purity of Materials:
- The formates were obtained by neutralizing dilute formic acid with p.a. grade $\ce{Y(OH)3}$ and basic cobalt carbonate.
Estimated Errors:
Ambient temperature: No information given.
Mass concentration (m/v) (1): No information given.
References
1 Fritz, J. S.; Oliver, R. T.; Pietryc, D. L.; Anal. Chem. 30, 1111 (1958).
Components:
- Cobalt formate, $\ce{ Co(CHO2)2 }$; [544-18-3] NIST WebBook
- Yttrium(III) formate, $\ce{ Y(CHO2)3 }$; [15331-71-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility values in the Co(CHO2)2-Y(CHO2)3-H2O system at 25°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 2.42 | - | 0.166 | - | A |
| 1.53 | 3.58 | 0.108 | 0.168 | A |
| 1.13 | 8.65 | 0.084 | 0.428 | A |
| 0.86 | 9.19 | 0.064 | 0.456 | A |
| 0.65 | 15.74 | 0.052 | 0.841 | A |
| 0.67 | 19.98 | 0.057 | 1.124 | A + B |
| 0.53 | 20.14 | 0.045 | 1.134 | B |
| - | 21.41 | - | 1.216 | B |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Co(CHO2)2·2H2O; B = Y(CHO2)3·2H2O.
