SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Balarew, C.; Vassileva, V.; Stoilova, D.; Comm. Dept. Chem. Bulg. Acad. Sci. 14, 57 (1981).
Conditions:
Room Temp: 10 - 80 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The decrease of supersaturation was studied isothermally in about a 2% excess of formic acid to suppress hydrolysis of the salt. Equilibrium was reached in two days. The nickel content of both the liquid and solid phases was determined by complexometric back-titration at pH 5.5-6 using Xylenol orange as indicator. The composition of the solid phase was also determined by X-ray diffraction and microscopic observations.
Sample Information:
- Nickel formate was prepared by dissolving basic nickel carbonate in dilute formic acid.
Measurement Errors:
Mass concentration (m/v) (1): The solubilities were determined in a slight excess of formic acid (about 2%) in order to inhibit salt hydrolysis.
System Components:
- Nickel formate, $\ce{ Ni(CHO2)2 }$; [3349-06-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | m1 (mol/kg) a | Phase (s) () b |
|---|---|---|---|
| 10 | 1.72 | 0.118 | A |
| 15 | 1.86 | 0.127 | A |
| 20 | 2.00 | 0.137 | A |
| 25 | 2.13 | 0.146 | A |
| 30 | 2.29 | 0.158 | A |
| 35 | 2.46 | 0.170 | A |
| 40 | 2.55 | 0.176 | A |
| 45 | 2.69 | 0.186 | A |
| 50 | 2.78 | 0.192 | A |
| 55 | 2.89 | 0.200 | A |
| 60 | 3.04 | 0.211 | A |
| 65 | 3.17 | 0.220 | A |
| 70 | 3.30 | 0.229 | A |
| 75 | 3.48 | 0.242 | A |
| 80 | 3.53 | 0.246 | A |
(a) These values were calculated by the compilers.
(b) The solid phase is: A = Ni(CHO2)2ยท2H2O.
