SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Balarew, C.; Stoilova, D. G.; Vassileva, V. Z.; Dokl. Bolg. Akad. Nauk 35, 933 (1982).
Conditions:
Room Temp: 10 - 80 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
Equilibrium was reached after about two days of stirring using the isothermal decrease of supersaturation method. The manganese content of the solid and liquid phases was determined complexometrically with Complexon III at pH 9.5-10, using Eriochrome Black T as indicator after adding hydroxylamine. The solid phases were studied microscopically and by the use of differential thermal analysis.
Sample Information:
- Manganese formate was prepared by the reaction of dilute formic acid with manganese carbonate. All reagents were p.a. grade.
Measurement Errors:
Mass concentration (m/v) (1): The solubility of the salt was determined in a slight excess of formic acid (about 2%) in order to inhibit hydrolysis.
System Components:
- Manganese(II) formate, $\ce{ Mn(CHO2)2 }$; [3251-96-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | m1 (mol/kg) | Phase (s) () |
|---|---|---|---|
| 10 | 5.33 | 0.388 | A |
| 15 | 5.96 | 0.437 | A |
| 20 | 6.15 | 0.452 | A |
| 25 | 6.28 | 0.462 | A |
| 30 | 6.69 | 0.495 | A |
| 35 | 6.97 | 0.517 | A |
| 40 | 7.47 | 0.557 | A |
| 45 | 7.83 | 0.586 | A |
| 50 | 8.08 | 0.606 | A |
| 55 | 9.09 | 0.690 | A |
| 60 | 9.68 | 0.739 | A |
| 65 | 9.80 | 0.749 | A |
| 70 | 11.54 | 0.900 | A |
| 75 | 11.75 | 0.918 | A |
| 80 | 12.44 | 0.980 | A |
(a) These values were calculated by the compilers.
(b) The solid phase is: A = Mn(CHO2)2ยท2H2O.
