IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Sodium formate with Sodium nitrate

Components:
   (1) Sodium formate; NaCHO2; [141-53-7]  NIST Chemistry WebBook for detail
   (2) Sodium nitrate; NaNO3; [7631-99-4]  NIST Chemistry WebBook for detail

Original Measurements:
   Berchiesi, M.A.; Cingolani, A.; Berchiesi, G., J. Chem. Eng. Data 17, 61-4 (1972).

Variables:

Prepared By:
   G. D. Andrea

Experimental Remarks:

   Note 1: There is a eutectic at 191 ºC and 100x₂ = 48.1.
Note 2: There is a peritectic at 204 ºC and 100x₂ = 34.4. The intermediate compound is Na₄(CHO₂)₃NO₃ and melts incongruently.

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


t/°C	T/K	Mole Fraction₂
257.50	530.65	0
249.50	522.65	5.17
242.73	515.88	9.88
237.58	510.73	12.69
234.43	507.58	15.04
231.65	504.80	16.59
229.03	502.18	18.12
226.58	499.73	19.41
226.13	499.28	20.08
223.98	497.13	21.53
221.35	494.50	22.78
219.85	493.00	24.00
217.73	490.88	26.08
215.08	488.23	27.19
213.55	486.70	28.04
213.05	486.20	28.61
210.30	483.45	30.07
207.54	480.69	32.03
205.85	479.00	33.07
204.50	477.65	33.99
203.50	476.65	35.98
202.13	475.28	38.09
201.25	474.40	39.99
199.25	472.40	42.01
195.38	468.53	44.96
193.50	466.65	46.61
192.10	465.25	48.57
195.75	468.90	49.93
200.87	474.02	51.67
208.93	482.08	55.09
220.70	493.85	60.01
243.03	516.18	70.02
263.95	537.10	79.90
284.98	558.13	90.04
306.00	579.15	100.00

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

Method/Apparatus/Procedure:
   A visual method, supplemented by DSC measurements was used. Salt(s) melted in a Pyrex device¹ were placed in a furnace whose temperature was controlled by a Chromel-Alumel thermouple connected to a L&N CAT control unit. The temperature of the melt was measured by a second thermouple checked by comparison with a certified Pt resistance thermometer and a L&N K-5 potentiometer.

Source and Purity of Materials:
   C. Erba (Milan, Italy) materials, at least 99% pure, were dried before being used.

Estimated Errors:
   Solubility: No information is given.
   Temperature: Accuracy of temperature measurement was ± 0.03 K.

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