NIST-IUPAC Solubility Data Series

Sodium formate with Formic Acid and Water (IUPAC SDS Volume 73)

SDS Volume

Volume 73. Metal and Ammonium Formate Systems, p None

Source Publication

Heubel, J.; Coupe, D.; C. R. Hebd Seances Acad. Sci. 250, 1058 (1960).

Conditions:

Room Temp: Composition at 293.2 $\pu{K}$

Compiler:

T.A. Ageyeva

Methodology:

The isothermal method was used. The sodium formate content was determined gravimetrically as NaCl. Formic acid content was determined by titration with 5 N $\ce{NaOH}$. The composition of the solid phases was determined by Schreinemakers method.

Sample Information:

No information is given.

Measurement Errors:

Ambient temperature: The termperature was controlled to within ±0.1%.

System Components:

Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] NIST WebBook
Formic acid, $\ce{ CH2O2 }$; [64-18-6] NIST WebBook
Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook

Experimental Data

100w₁	100w₂	100w₃	$100 x_{1}$	$100 x_{2}$	$100 x_{3}$	Phase (s) ()
45.25	0.0	54.75	17.96^a	0.0^a	82.04^a	A
45.70	3.31	50.99	18.81^a	2.02^a	79.18^a	A
46.14	6.28	47.58	19.63^a	3.95^a	76.42^a	A
46.90	8.92	44.18	20.68^a	5.81^a	73.51^a	A + B
45.38	12.76	41.86	20.42^a	8.48^a	71.10^a	B
42.38	20.78	36.84	19.98^a	14.47^a	65.55^a	B
41.19	26.58	32.23	20.38^a	19.43^a	60.19^a	B
40.11	34.66	25.23	21.50^a	27.45^a	51.05^a	B
39.10	39.77	21.13	22.02^a	33.08^a	44.90^a	B + C
38.91	41.85	19.24	22.44^a	35.67^a	41.89^a	Unstable
35.30	50.80	13.90	21.68^a	46.10^a	32.22^a	C
32.77	60.16	7.07	22.09^a	59.92^a	17.99^a	C
31.37	65.66	2.97	22.47^a	69.50^a	8.03^a	C

(a) These values were calculated by the compiler.

(b) The solid phases are: A = NaCHO₂·2H₂O; B = 3NaCHO₂·CH₂O₂; C = NaCHO₂·CH₂O₂.

IUPAC-NIST Solubility Data Series, SRD 106