SDS Volume (4612)

Volume 73. Metal and Ammonium Formate Systems, p None

Original Measurements

Balarew, C.; Vassileva, V.; Stoilova, D.; Comm. Dept. Chem. Bulg. Acad. Sci. 14, 57 (1981).

Variables:

Room Temp: Composition at 25 °C

Prepared by:

St. Trendafilova, Chr. Balarew

Method/Apparatus/Procedure:

Equilibrium was reached after about two days using the method described earlier [1]. The sum of the $\ce{Mg^{2+}}$ and $\ce{Cd^{2+}}$ content of both phases was determined by a complexometric back titration at pH 9-10, using Eriochrome Black T as indicator. $\ce{Cd^{2+}}$ was determined by a complexometric back titration at pH 5.5-6.0 using Xylenol Orange as indicator. The composition of the suction-dried mixed crystals was determined by the method of algebraic indirect identification of the solid phase [1].

Source and Purity of Materials:

1. The magnesium and cadmium formates were prepared by dissolving basic magnesium or cadmium carbonates in dilute formic acid. All materials were of analytical reagent grade.

Estimated Errors:

Ambient temperature: Not given.
Mass concentration (m/v) (1): The solubilities were determined in a slight excess for formic acid (about 2%) in order to inhibit salt hydrolysis.

References

¹ Balarew, Chr.; Karaivanova, V.; Oikova, T.; Comm. Dept. Chem. Bulg. Acad. Sci. 3, 637 (1970).
² Trendafelov, D.; Balarew, Chr.; Comm. Dept. Chem. Bulg. Acad. Sci. 1 , 73 (1968).