SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Portnova, S. M.; Ahmatova, Zh. T.; Lepeshkov, I. N.; Zh. Neorg. Khim. 31, 2143-5 (1986).
Conditions:
Room Temp: Composition at 50 °C
Compilers:
St. Trendafilova, St. Tepavitcharova
Methodology:
The isothermal method was used. Four weeks were allowed for equilibration. The strontium content of both phases was determined complexometrically in a basic medium, using methylthymolblue as indicator. The potassium content was determined by the tetraphenylborate method [1]. The composition of the solid phases was determined by the Schreinemakers' method.
Sample Information:
- Suprapure grade $\ce{Sr(CHO2)2.2H2O}$ was recrystallized. $\ce{KCHO2}$ was prepared by the reaction of $\ce{KOH}$ with $\ce{H2CO2}$.
Measurement Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
Methodology Citation
1 Rusakova, G. G.; Zh. Anal. Khim. 18, 154 (1963).
System Components:
- Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
- Strontium formate, $\ce{ Sr(CHO2)2 }$; [592-89-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w2 | 100w1 | m2 (mol/kg) | m1 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 16.69 | - | 1.13 | - | A |
| 10.24 | 6.06 | 0.69 | 0.86 | A |
| 2.65 | 20.57 | 0.19 | 3.18 | A |
| 2.35 | 45.50 | 0.25 | 10.37 | A |
| 2.88 | 55.57 | 0.39 | 15.90 | A |
| 5.65 | 56.93 | 0.85 | 18.09 | A + B |
| 1.15 | 56.53 | 0.15 | 15.88 | B |
| 1.36 | 62.44 | 0.21 | 20.51 | B |
| 0.25 | 62.12 | 0.04 | 19.62 | B |
| 0.95 | 64.42 | 0.15 | 22.11 | B |
| 0.35 | 75.26 | 0.08 | 36.68 | B |
| 0.23 | 78.09 | 0.06 | 42.82 | B |
| 84.69 | 84.69 | - | 65.76 | B |
(a) The solid phases are: A = Sr(CHO2)2ยท2H2O; B = KCHO2.
(b) The molality values were calculated by the compilers.
