Components:
(1) Sodium formate,
NaCHO2; [141-53-7]
NIST WebBook
(2) Sodium hydroxide,
NaOH; [1310-73-2]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Centola, P. G.; Rosso, R. E.; Mazzoccia, C. V.; J. Chem. Eng. Data 25, 170-1 (1980).
Variables:
Ambient temperature: Composition at 120 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
Weighed amounts of NaOH and formic acid were dissolved in deionized water and placed in closed 250 cm3 flasks. The flasks were placed in a constant temperature bath. Equilibrium was reached in 6 h. Samples were removed after 24 h and analyzed. The sodium formate content was determined by adding excess KMnO4 and titrating the excess iodometrically. NaOH was determined by titration with formic acid.
Source and Purity of Materials:
- Carlo Erba pure reagents were used.
Estimated Errors:
Ambient temperature: Accuracy of temperature measurement was ±0.05°C.
Experimental Values:
Liquid phase composition of the NaCHO2-NaOH-H2O system at 120°C.
| 100w2 | 100w1 | m2 (mol/kg)a | m1 (mol/kg)a |
|---|---|---|---|
| 0.0 | 65.6 | 0.0 | 28.0 |
| 12.6 | 44.8 | 7.39 | 15.5 |
| 15.9 | 35.7 | 8.21 | 10.8 |
| 36.6 | 18.0 | 20.2 | 5.83 |
| 37.3 | 15.6 | 19.8 | 4.87 |
| 79.2 | 0.0 | 95.2 | 0.0 |
(a) These values were calculated by the compilers.
