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Could some expert tell me the optimal pH value for preparing ammonium oxalate?

2009-02-24View Original

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Add an oxalic acid solution of 140 g/l to concentrated ammonium water to produce ammonium oxalate. The chief engineer told me that a pH of 4.5 represents the optimal condition; I only have a bachelor’s degree, and I don’t understand why pH 4.5 is the ideal value. Could someone with more expertise explain this to me?

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