SDS Volume (4622)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Fock, A.; Z. Kristallogr. u Mineralogie 28, 337-413 (1897).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
A saturated solution of one component was prepared at 25 °C. Then the second component was added while the mixture was heated. After cooling to 25 °C the crystals were removed, crushed and again added to the mixture, which was then stirred for 4 h. Samples were then removed for analysis. The lead was determined gravimetrically as PbS.
Source and Purity of Materials:
- Commercially available substances were used.
Estimated Errors:
Ambient temperature: Not given.
Components:
- Barium formate, $\ce{ Ba(CHO2)2 }$; [541-43-5] 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 Ba(CHO2)2-Pb(CHO2)2-H2O system at 25°C.
| 100w2 | 100w1 | D1|2 | $C_{1}$ (mg/L) | $C_{2}$ (mg/L) | m2 (mol/kg) | m1 (mol/kg) | Phase (s) () | ρ (g/cm3) |
|---|---|---|---|---|---|---|---|---|
| 0.0 | 23.42 | - | 0 | 1.255 x 103 | 0.0 | 1.345 | A | 1.2204 |
| 0.09 | 23.42 | 0.17 | 3.72 | 1.26 x 103 | 4 x 10-3 | 1.346 | B | 1.2213 |
| 0.23 | 23.65 | 0.13 | 9.44 | 1.274 x 103 | 0.010 | 1.366 | B | 1.2251 |
| 0.42 | 25.69 | 0.09 | 17.88 | 1.418 x 103 | 0.019 | 1.529 | B | 1.2529 |
| 0.93 | 23.65 | 0.09 | 38.49 | 1.286 x 103 | 0.041 | 1.379 | B | 1.2341 |
| 1.87 | 22.74 | 0.05 | 77.83 | 1.237 x 103 | 0.083 | 1.326 | B | 1.2355 |
| 2.50 | 0.0 | - | 95.50 | 0.0 | 0.090 | 0.0 | C | 1.0911 |
(a) These values, and the molalities, were calculated by the compilers.
(b) The solid phases are: A = Ba(CHO2)2; B = (Pb,Ba)(CHO2)2; C = Pb(CHO2)2.
