SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Portnova, S. M.; Palitskaya, T. A.; Zh. Neorg. Khim. 39, 163-168 (1994).
Conditions:
Room Temp: Composition at 25 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The isothermal solubility method was used. Four weeks were allowed for the attainment of equilibrium at a constant temperature. The composition of the liquid and wet solid phases was determined as follows.The $\ce{K^{+}}$ content was determined by the tetraphenylborate method and gravimetrically. $\ce{Ca^{2+}}$ was determined complexometrically in a basic medium, using methylthymol blue as indicator. The composition of the solid phases was determined by elemental analysis, thermogravimetrically, crystallo-optically and by X-ray diffraction. The composition of the suction dried solid phase was also determined by the Schreinemakers' method.
Sample Information:
- $\ce{KCHO2}$ was obtained by the reaction of $\ce{KOH}$ and p.a. grade $\ce{H2CO2}$ [1]. $\ce{Ca(CHO2)2}$ was obtained by the reaction of $\ce{Ca(OH)2}$ "pure" grade and $\ce{H2CO2}$.
Methodology Citation
1 Itkina, L. S.; Chaplygina, N. M.; Petrova, E. V.; Russ. J. Inorg. Chem. 24, 440-3 (1979).
System Components:
- Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
- Calcium formate, $\ce{ Ca(CHO2)2 }$; [544-17-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w2 | 100w1 | m2 (mol/kg) b | m1 (mol/kg) b | Phase (s) () a |
|---|---|---|---|---|
| 14.43 | - | 1.296 | - | A |
| 6.44 | 16.04 | 6.384 | 2.460 | A |
| 3.94 | 25.14 | 4.269 | 4.214 | A |
| 2.74 | 35.48 | 3.408 | 6.827 | A |
| 5.26 | 59.88 | 1.159 | 20.420 | A |
| 3.08 | 59.21 | 6.276 | 18.666 | A |
| 6.31 | 58.86 | 1.392 | 20.089 | A |
| 6.30 | 59.35 | 1.405 | 20.480 | A |
| 6.55 | 60.07 | 1.507 | 21.393 | A |
| 6.61 | 60.15 | 1.528 | 21.512 | A + B |
| 6.15 | 61.56 | 1.463 | 22.664 | B |
| 4.46 | 62.03 | 1.022 | 22.005 | B |
| 4.33 | 63.01 | 1.008 | 22.705 | B |
| 2.08 | 66.51 | 5.089 | 25.173 | B |
| 1.42 | 66.71 | 3.424 | 24.883 | B + C |
| 0.41 | 73.00 | 1.185 | 32.627 | B + C |
| 0.18 | 78.56 | 6.506 | 43.929 | B + C |
| 0.17 | 79.10 | 6.302 | 45.361 | C |
| - | 81.82 | - | 53.503 | C |
(a) The solid phases are: A = Ca(CHO2)2 , B = K4Ca(CHO2)6, C = KCHO2 .
(b) The molality values were calculated by the compilers.
