Showing papers in "Journal of the Indian Institute of Science in 1961"
Journal Article•
TL;DR: In this article, the influence of variation in the molar ratio of reactants on the compositions of the wet precipitates obtained at 25°C from the various systems of nickel salts and alkali carbonates was studied in detail.
Abstract: The precipitates obtained during the addition of an alkali carbonate to an aqueous nickel salt solution under reproducible conditions of precipiration were analysed in the wet state. The influence of variation in the molar ratio of reactants on the compositions of the wet precipitates obtained at 25°C from the various systems of nickel salts and alkali carbonates was studied in detail. The formation of three basic carbonates NiCO3 Ni(OH)2xH202 NiCCs3 2Ni(OH)2xH2O and NiCO3. 3Ni (OH)2. x H2O has been observed. Even when the composition of the wet precipitate NiC03. 3Ni (OH)2 x H2O did not undergo any appreciable change, it was found that the surf.tce ares increased with time as the precipitate ayed. The surface area measurements were made by means of dye adsorption.
4 citations
Journal Article•
TL;DR: In this article, a mechanism for the formation of basic nickel carbonates has been given on the basis of the hydrolysis of [Ni(H2O)B]+ + cation and the olation of the resulting species into aggregates of various polynuclear units.
Abstract: A mechanism for the formation of basic nickel carbonates has been given on thebasisof the hydrolysis of [Ni(H2O)B]+ + cation and the olation of the resulting species into aggregates of various polynuclear units. The resulting configurations basedon coordination number 4 for nickel, are supported by the nature of the water molecules involved, the coordinated water molecules being lost in the first stage of the decomposition and hydroxyl water and carbondioxide during the second stage. At higher temperatures, the 01 bridges are partly replaced in the precipitates by 0x0 bridges and also by carbonate bridges. Possible methods whereby the different species of basic nickel carbonates form three-dimensional aggregates have been given and evidence for the same obtained from determination of surface areas of the basic carbonates and their decomposition products.
3 citations
Journal Article•
TL;DR: In this paper, the precipitation of nickel from various systems of nickel salts and alkali carbonates has been followed under controlled conditions, and various factors that influence the precipitation process have been studied.
Abstract: The precipitation of nickel from various systems of nickel salts and alkali carbonates has been followed under controlled conditions. The various factors that influence the precipitation process have been studied and the condition for reproducible precipitation has been described.
3 citations