Components:
(1) Copper formate,
Cu(CHO2)2; [544-19-4]
NIST WebBook
(2) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Stoilova, D.; Balarew, C.; Vassileva, V.; Comm. Dept. Chem. Bulg. Acad. Sci. 18, 3 (1985).
Variables:
Ambient temperature: 10 - 70 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The method used was the isothermal decrease of supersaturation, under stirring, for 15-20 hrs. The Cu2+ content of the liquid and solid phases was determined complexometrically using Complexon III at pH 5.5-6.0 and Xylenol Orange as indicators.
Source and Purity of Materials:
- Analytical Reagent grade substances were used. The copper formate was obtained by neutralizing formic acid solutions with basic copper carbonate.
Estimated Errors:
Mass concentration (m/v) (1): The solubility of the salt is determined in a slight excess of formic acid (about 2%) to suppress salt hydrolysis.
Experimental Values:
Solubility polytherm of copper formate in water.
| T (°C) | 100w1 | m1 (mol/kg)a | Phase (s)b |
|---|---|---|---|
| 10.0 | 5.58 | 3.85 x 10-1 | A |
| 15.0 | 6.49 | 4.52 x 10-1 | A |
| 20.0 | 7.03 | 4.92 x 10-1 | A |
| 25.0 | 8.8 | 6.28 x 10-1 | A |
| 30.0 | 11.06 | 8.10 x 10-1 | A |
| 35.0 | 14.23 | 1.08 | A |
| 40.0 | 18.52 | 1.48 | A |
| 45.0 | 21.71 | 1.806 | B |
| 50.0 | 25.17 | 2.19 | B |
| 55.0 | 27.34 | 2.45 | B |
| 60.0 | 27.48 | 2.467 | C |
| 65.0 | 28.05 | 2.539 | C |
| 70.0 | 28.5 | 2.595 | C |
(a) These values were calculated by the compilers. (b) The solid phases are: A = Cu(CHO2)2·4H2O, B = Cu(CHO2)2·2H2O, C = Cu(CHO2)2.
