SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Fakeev, A. A.; Akhmatova, Zh. T.; Iskhakova, L. D.; Konkova, O. B.; Zhadanov, B. V.; Zh. Neorg. Khim. 41,702-704 (1996).
Conditions:
Room Temp: Composition at 25 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The system was studied by the isothermal solubility method. Equilibrium was reached in about 48 h. $\ce{Ni^{2+}}$ was determined complexometrically at pH 5 using 'tetra' as indicator [1]. $\ce{Sr^{2+}}$ was also determined complexometrically at pH 10.5-11.0 using Calzein and Thymolblue as indicator. The solid phase composition was determined by the graphic method of Schreinemakers', X-ray diffraction analysis and IR spectroscopy.
Sample Information:
- The formates of strontium and nickel were prepared by dissolving strontium carbonate and basic nickel carbonate, respectively, in formic acid. The reagents used were "p.a.'' grade.
Measurement Errors:
Ambient temperature: Not given.
Mass concentration (m/v) (1): Not given.
Methodology Citation
1 Jonassen, H. B.; Chamblin. C.; Wagner, V. L.; Henry, R. A.; Anal. Chem. 30, 10, 1660 (1958).
System Components:
- Strontium formate, $\ce{ Sr(CHO2)2 }$; [592-89-2] NIST WebBook
- Nickel formate, $\ce{ Ni(CHO2)2 }$; [3349-06-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w1 | 100w2 | m1 (mol/kg) a | m2 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|
| 11.8 | 0.00 | 0.753 | 0.00 | A |
| 11.6 | 0.20 | 0.740 | 0.015 | A |
| 11.6 | 0.50 | 0.742 | 0.038 | A + B |
| 11.6 | 0.50 | 0.742 | 0.038 | A + B |
| 10.7 | 0.60 | 0.679 | 0.045 | B |
| 9.0 | 0.700 | 0.561 | 0.052 | B |
| 7.1 | 0.700 | 0.433 | 0.051 | B |
| 5.4 | 0.90 | 0.324 | 0.064 | B |
| 4.0 | 1.00 | 0.237 | 0.070 | B |
| 2.4 | 1.10 | 0.139 | 0.076 | B |
| 1.2 | 1.40 | 0.070 | 0.097 | B |
| 0.0 | 1.90 | 0.000 | 0.130 | B |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = Sr(CHO2)2·2H2O; B = Ni(CHO2)2.·2H2O.
