Solubility System: Magnesium formate with Calcium formate and Water
Components:

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

Original Measurements

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

Variables:

Ambient temperature: Composition at 25 °C

Prepared by:

St. Trendafilova, Chr. Balarew

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:
  1. 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:

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

Experimental Values:
Solubility values in the Mg(CHO2)2-Ca(CHO2)2-H2O system at 25°C.
100w1 100w2 100w3 m1 (mol/kg)b m2 (mol/kg)b Phase (s)a pH n ρ (g/cm3)
0.0 14.43 85.57 0.0 1.296 A 6.56 1.358 1.109
1.19 13.73 85.08 1.22 x 10-1 1.24 A 7.1 1.3576 1.108
1.21 13.57 85.21 1.24 x 10-1 1.224 A 7.13 1.3574 1.109
5.0 11.5 83.8 5.22 x 10-1 1.055 A 6.92 1.3602 1.12
6.62 10.72 82.66 7.00 x 10-1 9.97 x 10-1 A 6.84 1.362 1.128
7.61 10.57 81.82 8.13 x 10-1 9.93 x 10-1 A 6.92 1.362 1.123
8.01 10.06 81.93 8.55 x 10-1 9.44 x 10-1 A + B 6.72 1.3646 1.146
8.38 9.92 81.7 8.97 x 10-1 9.33 x 10-1 B 6.78 1.3642 1.137
8.33 8.98 82.69 8.81 x 10-1 8.35 x 10-1 B 6.65 1.3639 1.132
10.66 4.47 84.87 1.098 4.05 x 10-1 B 6.87 1.3586 1.12
11.9 1.32 86.78 1.199 1.17 x 10-1 B 6.77 1.3568 1.094
11.8 0.0 88.11 1.171 0.0 B 5.7 1.3543 1.099

(a) The solid phases are: A = Ca(CHO2)2; B = Mg(CHO2)2·2H2O. (b) The molality values were calculated by the compilers.

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