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potassium pyrophosphate
Potassium pyrosulfate (potassium disulfate) is a chemical compound, K2S2O7. It contains the pyrosulfate anion S2O72- which has a dichromate like structure and can be visualised as two corner sharing SO4 tetrahedra, with a bridging oxygen atom.(1) A semi-structural formula for pyrosulfate ion is O3SOSO32-. In this compound sulfur has an oxidation state of plus6.