Compilation - Manganese formate with Water (IUPAC SDS Volume 73)
SDS Volume (4771)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Balarew, C.; Stoilova, D. G.; Vassileva, V. Z.; Dokl. Bolg. Akad. Nauk 35, 933 (1982).
Variables:
Room Temp: 10 - 80 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
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.
Source and Purity of Materials:
- Manganese formate was prepared by the reaction of dilute formic acid with manganese carbonate. All reagents were p.a. grade.
Estimated 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.
Components:
- Manganese(II) formate, $\ce{ Mn(CHO2)2 }$; [3251-96-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility polytherm of the Mn(CHO2)2-H2O system.
| $T$ (°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.
