Studies on the precipitation of lanthanum and cobalt oxalates and its gravimetric applications

Abstract

Precipitation of lanthanum and cobalt as oxalates has been studied individually and in combination Individually lanthanum and cobalt oxalates exist as deca- and dihydrates respectively, but the combined oxalate is only a hexahydrate. The compositions are also confirmed by thermogravimetric analysis. Quantitative precipitation of cobalt oxalate is effected by decreasing the dielectric constant of the precipitating medium with acetic acid, Cobalt oxalate can be-precipitated at higher pH by using non-interfering bases such as lutidine for pH adjustments, Lanthamum oxalate can be selectively and quantitatively separated from cobalt by complexing the latter with ammonium oxalate, Procedures are suggested for the simultaneous gravimetric analysis of lanthanum and cobalt in presence of each other.