[C:1]([OH:6])(=[O:5])[C:2]([OH:4])=[O:3].[O-2].[O-2].[O-2].[Cr+6:10]>O>[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[Cr+3:10].[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[C:1]([O-:6])(=[O:5])[C:2]([O-:4])=[O:3].[Cr+3:10]Oxalic acid (10.18 Kg) was added to water (9 l). Chromium trioxide (2720 g) was gradually added to the mixture with stirring while heating the mixture on a water bath to form a solution of chromium oxalate.
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