SDS Volume (4614)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Portnova, S. M.; Palitskaya, T. A.; Zh. Neorg. Khim. 34, 204-9 (1989).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Four weeks were allowed for equilibration. The $\ce{Ca^{2+}}$ content was determined complexometrically in a basic medium using Methylthymol blue as indicator. The $\ce{Pb^{2+}}$ content was determined trilonometrically. The composition of the solid phases was determined by the Schreinemakers' method, IR spectroscopy, DTA, and X-ray diffraction.
Source and Purity of Materials:
- The formates were obtained by neutralizing formic acid with PA grade calcium hydroxide and PA grade $\ce{PbCO3}$.
Estimated Errors:
Ambient temperature: No information is given.
Components:
- Calcium formate, $\ce{ Ca(CHO2)2 }$; [544-17-2] NIST WebBook
- Lead formate, $\ce{ Pb(CHO2)2 }$; [811-54-1] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility values in the Ca(CHO2)2-Pb(CHO2)2-H2O system at 25°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 0.0 | 2.00 | 0.0 | 0.07 | A |
| 2.32 | 0.79 | 0.18 | 0.03 | A |
| 3.99 | 0.74 | 0.32 | 0.03 | A |
| 8.01 | 0.79 | 0.67 | 0.03 | A |
| 13.70 | 1.30 | 1.24 | 0.05 | A + B |
| 14.07 | 1.42 | 1.28 | 0.06 | B |
| 14.10 | 1.22 | 1.28 | 0.05 | B |
| 14.56 | 1.03 | 1.33 | 0.04 | B |
| 14.43 | 0.0 | 1.30 | 0.0 | B |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Pb(CHO2)2; B = Ca(CHO2)2.
