IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Magnesium formate with Sodium hydroxide and Water

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Components:
   (1) Magnesium formate; Mg(CHO2)2; [557-39-1]  NIST Chemistry WebBook for detail
   (2) Sodium hydroxide; NaOH; [1310-73-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Gyunner, E.A.; Melnichenko, N.D.; Yakhkind, N.D.; Velmozhnii, I.S.; Katseva, G.N., Zh. Neorg. Khim. 24, 2172-2175 (1979).

Variables:

   Concentration = Composition at 20 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Data:   (Notes on the Nomenclature)
  

Ratio OH^-: Mg²⁺ in the liquid phase in the Mg(CHO₂)₂ - NaOH - H₂O system at 20 °C.

Chemical1	Phase	Mass Fraction w1	m1 [mol kg-1]	Chemical2	Solid Phase(s)
NaOH	Liquid	10.0	1.98	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	15.0	1.97	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	20.0	1.99	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	25.0	1.98	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	30.0	1.99	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	33.3	1.98	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	40.0	2.00	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	45.0	1.98	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	50.0	2.01	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	55.0	2.01	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	60.0	1.96	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	62.5	---	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	65.0	---	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	66.7	1.99	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	70.0	2.01	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	75.0	2.01	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	80.	1.97	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	85.0	2.02	Mg(CHO2)2	Mg(OH)2
NaOH	Liquid	90.0	2.02	Mg(CHO2)2	Mg(OH)2

Method/Apparatus/Procedure:
   The system is studied by the method of physico-chemical analysis. After attaining the equilibrium, the residue concentrations of Mg²⁺ and OH^- are measured and also diffraction coefficient (n) of the liquid phases. The methods of measurements are according to Ref. 1.

Source and Purity of Materials:
   The magnesium formate is obtained from magnesium carbonate and formic acid. The obtained product is twice recrystallized.

Estimated Errors:

   Temperature: t =±0.05 °C.

References:
   ¹E. A. Gyunner, N. D. Melnichenko, N. D. Yakhkind, G. N. Bobrishev, and G. N. Katseva, Zh. Neorg. Khim. 23, 711 (1978).

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Last updated: February 18, 2015 (Created: August 17, 2007)