Components:
(1) Copper formate,
Cu(CHO2)2; [544-19-4]
NIST WebBook
(2) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Gauthier, J.; Thèses faculté des sciences de l'université de Paris, 65-71 (1958).
Variables:
Ambient temperature: range of -0.595 - 64 °C
Prepared by:
Method/Apparatus/Procedure:
It appears that the isothermal method was used. Above 0°C a Dewar flask with a Robertean thermometer graduated in 0.01 °C was used. Below 0 °C a mixture of water and salt was used to cool a jacket containing acetone or methanol. The copper content was determined electrolytically.
Source and Purity of Materials:
- Distilled water was used.
Estimated Errors:
Mass concentration (m/v) (1): ±0.07 mass% (from the eutectic point).
Experimental Values:
Solubility polytherm of the Cu(CHO2)2-H2O system
| T (°C) | 100w1 | m1 (mol/kg)a | Phase (s)b |
|---|---|---|---|
| -1.55 x 10-1 | 5.9 x 10-1 | 3.86 x 10-2 | Ice |
| -2.75 x 10-1 | 1.19 | 7.84 x 10-2 | Ice |
| -2.85 x 10-1 | 1.27 | 8.40 x 10-2 | Ice |
| -3.45 x 10-1 | 1.52 | 1.003 x 10-1 | Ice |
| -3.75 x 10-1 | 1.71 | 1.131 x 10-1 | Ice |
| -4.45 x 10-1 | 2.07 | 1.378 x 10-1 | Ice |
| -5.05 x 10-1 | 2.41 | 1.610 x 10-1 | Ice |
| -5.15 x 10-1 | 2.44 | 1.630 x 10-1 | Ice |
| -5.55 x 10-1 | 2.71 | 1.814 x 10-1 | Ice |
| -5.85 x 10-1 | 2.86 | 1.914 x 10-1 | Ice + A |
| -5.7 x 10-1 | 2.92 | 1.956 x 10-1 | Ice + A |
| -5.95 x 10-1 | 2.96 | 1.988 x 10-1 | - |
| 0.0 | 2.97 | 1.996 x 10-1 | A |
| 10.0 | 4.63 | 3.162 x 10-1 | A |
| 15.0 | 6.07 | 4.206 x 10-1 | A |
| 20.0 | 7.32 | 5.141 x 10-1 | A |
| 25.0 | 9.92 | 7.172 x 10-1 | A |
| 30.0 | 11.73 | 8.652 x 10-1 | A |
| 35.0 | 16.64 | 1.3 | A |
| 56.0 | 24.67 | 2.132 | B |
| 64.0 | 31.12 | 2.942 | B |
(a) These values were calculated by the compiler. (b) The solid phases are: A = Cu(CHO2)2·4H2O, B = Cu(CHO2)2·2H2O.
