SDS Volume

Volume 73. Metal and Ammonium Formate Systems, p None

Source Publication

Balarew, C.; Stoilova, D.; Vassileva, V.; J. Solid State Chem. 57, 260-6 (1985).

Conditions:

Room Temp: Composition at 25 °C

Compilers:

St. Trendafilova, Chr. Balarew

Methodology:

The method used was the isothermal decrease of supersaturation, under stirring, for 15-20 hrs. in an argon atmosphere to prevent oxidation of $\ce{Fe^{2+}}$. The $\ce{Fe^{2+}}$ content of the liquid and solid phases was determined complexometrically at pH 1.5 using sulfosalicylic acid as indicator after preliminary oxidation of $\ce{Fe^{2+}}$ by $\ce{H2O2}$. The sum of $\ce{Fe^{2+}}$ and $\ce{Co^{2+}}$ was also determined complexometrically at pH 5.5 using Xylenol Orange as indicator after first oxidizing the $\ce{Fe^{2+}}$ with $\ce{H2O2}$. The composition of the suction-dried mixed crystals was determined by the algebraic indirect identification of the solid phase composition method [1]. They were also studied by X-ray diffraction.

Sample Information:

1. The reagents used were of p.a. grade. Zinc formate was prepared by the action of dilute formic acid with zinc basic carbonate. The iron formate was prepared by dissolving powdered iron in dilute formic acid.

Measurement Errors:

Mass concentration (m/v) (1): The solubility of the salts was determined in a slight excess of formic acid (about 2%) to suppress salt hydrolysis.

Methodology Citation

¹ Trendafelov, D.; Balarew, Chr.; Comm. Dept. Chem. Bulg. Acad. Sci. 1 , 73 (1968).