SDS Volume (4668)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Gyunner, E. A.; Melnichenko, N. D.; Yakhkind, N. D.; Velmozhnii, I. S.; Katseva, G. N.; Zh. Neorg. Khim. 24, 2172-2175 (1979).
Variables:
Room Temp: Composition at 20 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The system is studied by the method of physico-chemical analysis. After attaining the equilibrium, the residue concentrations of $\ce{Cu^{2+}}$ and $\ce{OH^{-}}$ are measured and also the refractive index ($n$) of the liquid phases. The methods of measurements are according to [1].
Source and Purity of Materials:
- The cademium formate is obtained from copper carbonate and formic acid. The obtained product is twice recrystallized.
Estimated Errors:
Ambient temperature: t = ±0.05°C.
References
1 Gyunner, E. A.; Melnichenko, N. D.; Yakhkind, N. D.; Bobrishev, G. N.; Katseva, G. N.; Zh. Neorg. Khim. 23, 711 (1978).
Components:
- Copper formate, $\ce{ Cu(CHO2)2 }$; [544-19-4] NIST WebBook
- Sodium hydroxide, $\ce{ NaOH }$; [1310-73-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Ratio OH-:Cu2+ in the liquid phase in the Cu(CHO2)2-NaOH-H2O system at 20°C.
| $100 x_{2}$ | $100 x_{1}$ | Phase (s) () |
|---|---|---|
| 10.0 | 1.52 | A |
| 15.0 | 1.53 | A |
| 20.0 | 1.50 | A |
| 25.0 | 1.52 | A |
| 30.0 | 1.48 | A |
| 33.3 | 1.49 | A |
| 40.0 | 1.50 | A |
| 45.0 | 1.51 | A |
| 50.0 | 1.52 | A |
| 55.0 | 1.47 | A |
| 60.0 | 1.51 | A |
| 62.5 | 1.67 | A |
| 65.0 | - | A |
| 66.7 | 2.00 | B |
| 70.0 | 2.01 | B |
| 75.0 | 2.03 | B |
| 80.0 | 2.01 | B |
| 85.0 | 1.98 | B |
| 90.0 | 2.03 | B |
(a) The solid phases are: A = Cu2(OH)3(CHO2); B = Cu(OH)2.
