Components:
(1) Copper formate,
Cu(CHO2)2; [544-19-4]
NIST WebBook
(2) Yttrium(III) formate,
Y(CHO2)3; [15331-71-2]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Portnova, S. M.; Balakieva, I. V.; Krassilov, Yu. I.; Zh. Neorg. Khim. 35, 230-5 (1990).
Variables:
Ambient temperature: 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 Y3+ and Cu2+ contents were determined complexometrically using diethyldithiocarbamate.1 The composition of the solid phases ws determined by the Schreinemakers method.
Source and Purity of Materials:
- The formates were obtained by neutralizing dilute formic acid with p.a. grade Y(OH)3 and basic copper carbonate.
Estimated Errors:
Ambient temperature: Not given.
References
1 Fritz, J. S.; Oliver, R. T.; Pietryc, D. L.; Anal. Chem. 30, 1111 (1958).
Experimental Values:
Solubility values in the Cu(CHO2)2-Y(CHO2)3-H2O system at 25°C.
| 100w1 | 100w2 | m1 (mol/kg)a | m2 (mol/kg)a | Phase (s)b |
|---|---|---|---|---|
| 9.46 | - | 6.80 x 10-1 | - | A |
| 8.73 | 5.92 | 6.66 x 10-1 | 3.10 x 10-1 | A |
| 8.63 | 11.84 | 7.07 x 10-1 | 6.65 x 10-1 | A |
| 9.58 | 16.89 | 8.48 x 10-1 | 1.026 | A |
| 10.83 | 20.07 | 1.021 | 1.297 | A + B |
| 7.99 | 20.02 | 7.23 x 10-1 | 1.242 | B |
| 1.61 | 19.7 | 1.33 x 10-1 | 1.118 | B |
| 6.5 x 10-1 | 19.73 | 5.3 x 10-2 | 1.106 | B |
| - | 21.41 | - | 1.216 | B |
(a) The molality values were calculated by the compilers. (b) The solid phases are: A = Cu(CHO2)2·4H2O; B = Y(CHO2)3·2H2O.
