IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Magnesium formate with Calcium formate and Water

Components:
   (1) Calcium formate; Ca(CHO2)2; [544-17-2]  NIST Chemistry WebBook for detail
   (2) Magnesium formate; Mg(CHO2)2; [557-39-1]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Eremeeva, I.L.; Kalacheva, V.G.; Schwartz, E., Izv. Acad. Nauk. Latv. SSR, Ser. Khim. N 6, 666-8 (1977).

Variables:

   Concentration = Composition at 25 ºC

Prepared By:
   St. Trendafilova and Chr. Balarew

Experimental Remarks:

   The molality values were calculated by the compilers.

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

Solubility values in the Mg(CHO₂)₂-Ca(CHO₂)₂-H₂O system at 25 °C.
pH	Chemical₁	Phase	Mass Fraction w₁	m₁ [mol kg-1]	Chemical₂	Mass Fraction w₂	m₂ [mol kg-1]	Chemical₃	Mass Fraction w₃	Solid Phase(s)^a	Refractive Index	ρ [g·cm-3]
6.56	Mg(CHO2)2	Liquid	0.00	0.00	Ca(CHO2)2	14.43	1.296	H2O	85.57	A	1.3580	1.109
7.10	Mg(CHO2)2	Liquid	1.19	0.122	Ca(CHO2)2	13.73	1.240	H2O	85.08	A	1.3576	1.108
7.13	Mg(CHO2)2	Liquid	1.21	0.124	Ca(CHO2)2	13.57	1.224	H2O	85.21	A	1.3574	1.109
6.92	Mg(CHO2)2	Liquid	5.00	0.522	Ca(CHO2)2	11.50	1.055	H2O	83.80	A	1.3602	1.120
6.84	Mg(CHO2)2	Liquid	6.62	0.700	Ca(CHO2)2	10.72	0.997	H2O	82.66	A	1.3620	1.128
6.92	Mg(CHO2)2	Liquid	7.61	0.813	Ca(CHO2)2	10.57	0.993	H2O	81.82	A	1.3620	1.123
6.72	Mg(CHO2)2	Liquid	8.01	0.855	Ca(CHO2)2	10.06	0.944	H2O	81.93	A + B	1.3646	1.146
6.78	Mg(CHO2)2	Liquid	8.38	0.897	Ca(CHO2)2	9.92	0.933	H2O	81.70	B	1.3642	1.137
6.65	Mg(CHO2)2	Liquid	8.33	0.881	Ca(CHO2)2	8.98	0.835	H2O	82.69	B	1.3639	1.132
6.87	Mg(CHO2)2	Liquid	10.66	1.098	Ca(CHO2)2	4.47	0.405	H2O	84.87	B	1.3586	1.120
6.77	Mg(CHO2)2	Liquid	11.90	1.199	Ca(CHO2)2	1.32	0.117	H2O	86.78	B	1.3568	1.094
5.70	Mg(CHO2)2	Liquid	11.80	1.171	Ca(CHO2)2	0.00	0.00	H2O	88.11	B	1.3543	1.099

Notes:
   ^a  The solid phases are: A = Ca(CHO₂)₂; B = Mg(CHO₂)₂•2H₂O.

Method/Apparatus/Procedure:
   The isothermal method was used. The methods of analysis are not described. The composition of the solid phases was determined by the Schreinemakers' method.

Source and Purity of Materials:
   The calcium and magnesium formates were prepared by the action of pure acid on the corresponding hydroxides. The salt was obtained by evaporation and was recrystallized twice from water.

Estimated Errors:

   Temperature: The temperature was controlled to within ±0.02 °C. No other information is given.