IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Sodium bromide with Sodium formate
Components:
   (1) Sodium bromide; NaBr; [7647-15-6]  NIST Chemistry WebBook for detail
   (2) Sodium formate; NaCHO2; [141-53-7]  NIST Chemistry WebBook for detail
Original Measurements:
   Leonesi, D.; Braghetti, M.; Cingolani, A.; Franzosini, P., Z. Naturforsch. 25a, 52-5 (1970).

 Variables:


Prepared By:
   P. Baldini

 Experimental Remarks:
   Note 1: In the original paper the results were shown in graphical form. The numerical values listed above were given in a personal communication from one of the authors (F.P.) to the compiler.
Note 2: The system could not be investigated above about 300 ºC due to the thermal instability of the formate.
Note 3: There is a eutectic at 243.5 ºC and 100x1 = 9.5.

 Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)   
t/°CT/K100 * Mole Fraction1
257.5530.7  0
254.5527.7  2.02
251.8525.0  3.91
250.4523.6  4.99
248.8522.0  6.01
245.7518.9  8.00
244.2517.4  8.98
250.9524.110.00
265.1538.311.04
274.0547.211.76
296.1569.313.55
 Notes:
   a  The T/K values were calculated the compiler.

 Method/Apparatus/Procedure:
   A Pyrex device, suitable for work under an inert atmosphere, and allowing one to observe the system visually, was used (for details, refer to Ref. 1). The initial crystallization temperatures were measured with a Chromel-Alumel thermouple checked by comparison with a certified Pt resistance thermometer, and connected to a L&N Type K-3 potentiometer.

 Source and Purity of Materials:
   C.Erba RP materials, dried by heating under vacuum, were used.

 Estimated Errors:
   Solubility: No information is given.
   Temperature: The compiler estimates the accuracy of the temperature measurements to be probably ± 0.1 K.

 References:
   1M. Braghetti, D. Leonesi, and P. Franzosini, Ric. Sci. 38, 116 (1968).