[O-:1][P:2]([O:5][O:6][P:7]([O-:10])([O-:9])=[O:8])(=[O:4])[O-:3].[K+].[K+].[K+].[K+].O.O.[Cl-].[Ca+2:18].[Cl-]>O>[O-:3][P:2]([O:5][O:6][P:7]([O-:10])([O-:9])=[O:8])(=[O:1])[O-:4].[Ca+2:18].[Ca+2:18]Dissolve 3.46 grams of potassium peroxydiphosphate in 10 ml of water. To this solution, add 2.94 grams of calcium chloride dihydrate under stirring, in order to precipitate calcium peroxydiphosphate. Filter the resulting slurry and wash it with distilled water. The solid to be recovered contains calcium peroxydiphosphate.
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