IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Sodium formate with Sodium isobutanoate

Components:
   (1) Sodium formate; NaCHO2; [141-53-7]  NIST Chemistry WebBook for detail
   (2) Sodium isobutanoate; NaC4H7O2; [996-30-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Sokolov, N.M., Zh. Obshch. Khim. 24, 1581-93 (1954).

Variables:

Prepared By:
   P. Baldini

Experimental Remarks:

   Note: There are two eutectics: one at 252 ºC and 100x₂ = 1.3; the other at 250 ºC and 100x₂ = 96.5.

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)


t/°C	T/K	Mole Fraction₂
258	531	0
252	525	1.3
290	563	5
305	578	10
314	587	15
319	592	20
321	594	25
324	597	30
326	599	35
327	600	40
329	602	45
330	603	50
329	602	55
327	600	60
325	598	65
320	593	70
314	587	75
306	579	80
296	569	85
282	555	90
258	531	95
250	523	96.5
260	533	100

Notes:
   ^a  The T/K values were calculated the compiler.

Method/Apparatus/Procedure:
   A visual polythermal method was used. The melts were contained in glass tubes and stirred. The temperatures were measured with a Nichrome-Constantan thermouple and a 17mV full scale millivoltmeter. The temperature readings refer to the disappearance of isotropicity in the melt on cooling.

Source and Purity of Materials:
   The materials were prepared by reacting aqueous "chemically pure" sodium carbonate with a slight excess of the analytical grade proper acid. The solvent and excess acid were removed by heating to 160 °C.

Estimated Errors:
   Solubility: No information is given.
   Temperature: The compiler estimates the accuracy of the temperature measurements to be probably ± 2 K.