SDS Volume (4685)

Volume 73. Metal and Ammonium Formate Systems, p None

Original Measurements

Itkina, L. S.; Nadzharyan, K. A.; Lepeshkov, I. N.; Zh. Neorg. Khim. 26, 1086-91 (1981).

Variables:

Room Temp: Composition at 25 °C

Prepared by:

St. Trendafilova, Chr. Balarew

Method/Apparatus/Procedure:

The isothermal method was used. Equilibrium was reached in two weeks. The $\ce{NH4^{+}}$ content was determined by the tetraphenylborate method. The cadmium content was determined by complexometric titration using Eriochrome Black T as indicator. The barium content was determined gravimetrically. The composition of the solid phases was determined by Schreinemakers method, by DT analysis, IR spectroscopy and X-ray diffraction.

Source and Purity of Materials:

1. $\ce{Cd(CHO2)2.2H2O}$ was prepared by neutralizing 85% formic acid with PA grade $\ce{CdCO3}$. PA grade $\ce{Ba(CHO2)2}$ was used. The barium and cadmium formates were recrystallized twice from a 1% formic acid solution. Ammonium formate was prepared by passing $\ce{NH3}$ into 90% formic acid. The crystals were washed with ethanol and dried under vacuum over sulfuric acid.

Estimated Errors:

Ambient temperature: The temperature was controlled to within ±0.1°C.