basicity of oxalic acid

... and analyzing Standard value 1 content (C2H2O4) ％≥ 99.6 2 Sulfide (as SO4) ％≤ 0.07 3 Combustion residue ％≤ 0.01 4 heavy metal (as Pb) ...

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... in ethanol. It is green in concentrated sulfuric , blue after dilution, and turns to red. Its aqueous solution produces a brown-red precipitat...

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