Abstract
The reactions of oxalic acid with Mg 2+, Ca 2+ and Zn 2+ in aqueous medium were investigated. When 0·01 m oxalic acid solutions spiked with various levels of Zn 2+ were titrated against standard KMnO 4 solutions, a linear relationship was obtained between the amount of precipitated oxalate and the metal ion concentrations. A similar observation was made for Ca 2+, but higher proportions of the oxalate were precipitated at equivalent metal ion concentrations. The relationshps were also confirmed by titrating standard metal ion solutions, spiked with various levels of oxalic acid, against standard EDTA solutions. When Mg 2+ was present in solution with Zn 2+ or Ca 2+ or with the mixture, it inhibited the precipitation of the oxalates. The inhibitory action was most noticeable when the metal ions were present in solution in a 1:1:1 molar ratio. In all cases, the higher the proportion of Mg 2+, the less the precipitation of the oxalates of the other two metals.
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