[O-2].[La+3:2].[O-2].[O-2].[La+3].O.[N+:7]([O-:10])([OH:9])=[O:8]>>[N+:7]([O-:10])([O-:9])=[O:8].[La+3:2].[N+:7]([O-:10])([O-:9])=[O:8].[N+:7]([O-:10])([O-:9])=[O:8]Lanthanum oxide (La2O3) (212 g, 0.065 mole) was completely dissolved in an aqueous nitric acid solution, after which the solution was concentrated by heating to prepare lanthanum nitrate, to which was added water to give 400 cc of an aqueous lanthanum nitrate solution.
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