SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Berniyazova, D. G.; Kalacheva, V. G.; Schwartz, E. M.; Zh. Neorg. Khim. 31, 1045-8 (1986).
Conditions:
Room Temp: Composition at 15 °C
Compilers:
St. Trendafilova, St. Tepavitcharova
Methodology:
The isothermal method was used. Equilibrium was achieved within 4 hours. The boron concentration was determined by titration with alkali using phenolphtalein and mannitol, after the sample had been evaporated to dryness, ignited at 60 °C and dissolved in boiling $\ce{HCl}$ [1]. The formate content was determined from the carbon content by ignition. The composition of the solid phases was determined by the Schreinemakers' method.
Sample Information:
- p.a. grade $\ce{NaCHO2}$ and suprapure grade $\ce{Na2B4O7}$ were used.
Measurement Errors:
Mass concentration (m/v) (1): Solid phase B is probably NaCHO2·2H2O.
Methodology Citation
1 Knipovich, Yu. N.; Morachevskii, Yu. V.; Analysis of Mineral Ores, 3rd ed., (L. Gostechizdat, p. 281, 1959).
System Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
- Sodium tetraborate, $\ce{ Na2B4O7 }$; [1330-43-4] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w2 | 100w1 | m2 (mol/kg) a | m1 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|
| 2.79 | - | 0.14 | - | A |
| 2.73 | 6.14 | 0.15 | 0.99 | A |
| 2.53 | 12.63 | 0.15 | 2.19 | A |
| 2.47 | 18.24 | 0.15 | 3.38 | A |
| 2.24 | 20.52 | 0.14 | 3.91 | A |
| 2.04 | 24.16 | 0.14 | 4.81 | A |
| 1.94 | 25.35 | 0.13 | 5.13 | A |
| 1.59 | 29.52 | 0.11 | 6.30 | A |
| 1.47 | 31.52 | 0.11 | 6.92 | A |
| 1.23 | 35.21 | 0.10 | 8.15 | A |
| 1.17 | 37.88 | 0.10 | 9.14 | A |
| 1.09 | 39.26 | 0.09 | 9.68 | A |
| 0.98 | 39.98 | 0.08 | 9.96 | A |
| 0.86 | 40.64 | 0.07 | 10.22 | A + B |
| 0.63 | 40.56 | 0.05 | 10.14 | B |
| - | 41.82 | - | 10.57 | B |
(a) These values were calculated by the compilers.
(b) The solid phases are: A = Na2B4O7·10H2O; B = NaCHO2.
