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

Bianco, P.; Haladjian, J.; Sabbah, R.; Bull. Soc. Chim. Fr. 7, 2301 (1969).

Conditions:

Room Temp: Composition at 25 °C

Compiler:

T.A. Ageyeva

Methodology:

The isothermal method was used. The sodium formate content was determined by potentiometric titration. The solid phase was identified by thermogravimetry and Schreinemakers method.

Sample Information:

Analytical $\ce{NaCHO2}$ was used as received. Commercial a.r. grade formic acid contained less than 2% water. Deionized water was used.

Measurement Errors:

Ambient temperature: The temperature was controlled to within ±0.05°C. For the solubility it was ±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) () ^b
32.64	64.31	3.05	23.45^a	68.28^a	8.27^a	A
33.59	57.96	8.45	22.23^a	56.68^a	21.1^a	A
34.79	53.06	12.15	21.88^a	49.29^a	28.83^a	A
35.91	47.80	16.29	21.37^a	42.04^a	36.59^a	A
37.81	44.20	17.99	22.11^a	38.19^a	39.70^a	A
38.10	43.00	18.90	22.03^a	36.73^a	41.24^a	A + B
38.22	42.78	19.00	22.07^a	36.51^a	41.42^a	B
38.69	39.52	21.79	21.58^a	32.56^a	45.86^a	B
39.78	33.63	26.59	20.95^a	26.18^a	52.87^a	B
40.24	27.72	32.04	19.91^a	20.26^a	59.83^a	B
41.82	22.29	35.89	19.89^a	15.67^a	64.44^a	B
46.68	9.93	43.39	20.74^a	6.52^a	72.74^a	B
47.60	8.37	44.03	21.05^a	5.47^a	73.48^a	B
48.00	6.40	45.60	20.91^a	4.12^a	74.97^a	B + C
48.21	5.89	45.90	20.95^a	3.78^a	75.27^a	C
48.62	2.84	48.54	20.60^a	1.78^a	77.62^a	C

(a) These values were calculated by the compiler.

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

IUPAC-NIST Solubility Data Series, SRD 106