Potassium disulfite (Potassium pyrosulfate) has been synthesized from potassium hydrogen sulfate, via melting. Synonyms: Potassium pyrosulfate Molecular Formula: K2S2O7 Molecular Weight: 254.32 Linear Structural Formula: K2S2O7 MDL Number: MFCD00011385 Purity: >=97.5% (T) …