Abstract
The reaction between biacetyl and hydroxylamine to form dimethylglyoxime was found to follow simple kinetics in the absence of nickel. However, with nickel II present, the kinetic studies showed definite evidence for complex formation between biacetyl monoxime and nickel. This complex and others formed with nickel in the reaction mixture determines the overall rate of formation of nickel dimethyl-glyoximate. Supersaturation concentrations of several hundred times the equilibrium solubility of nickel dimethylglyoximate were attained in nucleation experiments. The kinetic and nucleation studies provide explanations for some previously anomalous experimental observations, e.g., the persistent supersaturation in this system provides an explanation for the inability to precipitate completely small amounts of nickel II with dimethylglyoxime. The yellow colour observed in the initial stage of the precipitation of nickel from homogeneous solution arises from dissolved nickel dimethylglyoximate.
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