IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Magnesium formate with Water

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

Original Measurements:
   Ashton, F.W.; Houston, D.F.; Saylor, C.P., J. Res. Nat. Bur. Stand. 11, 233-53 (1933).

Variables:
   Temperature = -5.05 ºC to 100 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Remarks:

   The molality values were calculated by the compilers.

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

Solubility of magnesium formate in water.
t/°C	g₁/g₂	Phase	Mass Fraction w₁	m₁ [mol kg-1]	Solid Phase(s)^a
-5.05	14.0	Liquid	12.3	1.22	A+B
0	14.0	Liquid	12.3	1.22	A
10	14.1	Liquid	12.4	1.23	A
20	14.4	Liquid	12.6	1.26	A
30	15.0	Liquid	13.0	1.31	A
40	15.9	Liquid	13.7	1.39	A
50	16.8	Liquid	14.4	1.47	A
60	18.0	Liquid	15.3	1.57	A
70	19.2	Liquid	16.1	1.68	A
80	20.6	Liquid	17.1	1.80	A
90	22.2	Liquid	18.2	1.94	A
100	24.0	Liquid	19.4	2.10	A

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

Method/Apparatus/Procedure:
   The isothermal method was used. Samples were taken at 6 and 18 hours, filtered into weighing bottles and weighed. They were then evaporated to dryness and the residue ignited to MgO.The lower portion of the solubility curve and the eutectic were determined by freezing point measurements. These determinations were made in a Beckmann type apparatus with a thermometer graduated in 0.1 °C.

Source and Purity of Materials:
   Magnesium formate was prepared by adding basic magnesium carbonate to excess formic acid. It was recrystallized from an aqueous solution containing a small amount of formic acid to prevent formation of basic salts.

Estimated Errors:
   Solubility: ±0.25 g/100 g H₂O.