Solubility System: Magnesium formate with Boric acid and Water (Original Report)
(2) Boric acid, H3BO3; [10043-35-3] NIST Chemistry WebBook
(3) Water, H2O; [7732-18-5] NIST Chemistry WebBook
|w1||m1 (mol/kg) [Note: $^a]||Phase [Note: ^b]||Phase|
|11.86||5.15||1.25||1||A + B||Liquid|
a) The molality values were calculated by the compilers.
b) The solid phases are: A = Mg(CHO2)2·2H2O; B = H3BO3.
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.
(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.
Temperature: The temperature was controlled to within ±0.02°C.