STUDIES ON THE BASIC CARBONATES OF NICKEL Part IV: Preparation of Basic Nickel Carbonates and their Differential Thermal Analysis

Abstract

Several samples of basic nickel carbonates were prepared under different experimental conditions obtained by varying the ratio of reactants, temperature, mode of precipitirtion and period Of agelng Three basic nickel carbonates of composition 2NiO.CO2 5H20 ; 3N2O.CO2.6H20 and 4Ni0.CO2.7H20 were prepared at 25°C by drying prccipitates over anhydrous calcium chloride and tujo others of composition ZNi0.C0.3H2O and 4XNi0.C02.5H20 by drying these samples further in vacuo over phosphorus pentoxide A few samples of basic carbonatcs obtaimd at 97°C from boilins solutions had very small carbonate contents. Differential thermal analysis of some of these samples showed that two endothermic reactions take place on heating. the samples at a uniform rate up to 600°C.