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Solubility System: Magnesium formate with Boric acid and Water (Original Report)

Components:
(1) Magnesium formate, Mg(CHO2)2; [557-39-1] NIST Chemistry WebBook
(2) Boric acid, H3BO3; [10043-35-3] NIST Chemistry WebBook
(3) Water, H2O; [7732-18-5] NIST Chemistry WebBook
Original Measurements
Kalacheva, V. G. ; Eremeeva, I. L. ; Schwartz, E. M. ; Izv. Acad. Nauk. Latv. SSR, Ser. Khim. N 4, 406-9 (1977).

Variables:
Concentration: Composition at 25°C
Experimental Data:
w1 m1 (mol/kg) [Note: $^a]Phase [Note: ^b]Phase
11.891.18ALiquid
11.8811.1930.186ALiquid
11.882.421.2120.457ALiquid
11.863.151.220.599ALiquid
11.784.111.2250.79ALiquid
11.865.151.251A + BLiquid
11.605.201.2191.01BLiquid
11.305.201.1831.01BLiquid
7.385.430.741.01BLiquid
2.565.480.2430.964BLiquid
1.875.500.1770.96BLiquid
5.510.943BLiquid

a) The molality values were calculated by the compilers.
b) The solid phases are: A = Mg(CHO2)2·2H2O; B = H3BO3.

Method/Apparatus/Procedure:

The isothermal method was used. The mixtures were shaken in sealed glass vessels for 5-6 hrs. The boric acid concentration was determined by titration with alkali using mannitol. The Mg2+ content was determined complexometrically using Complexon III. The composition of the solid phases was determined by the Schreinemakers method.

Source and Purity of Materials:

(1) p.a. grade boric acid was recrystallized from water. Magnesium formate dihydrate was obtained by the reaction of Mg(OH) 2 and formic acid. The solid was recrystallized twice from water.

Estimated Errors

Temperature: The temperature was controlled to within ±0.02°C.

References:

No references.

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