Sodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7.[1] It is a colorless salt.[3] It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.
Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:[4][5]
Temperatures above 460 °C further decompose the compound, producing sodium sulfate and sulfur trioxide:
Sodium pyrosulfate was used in analytical chemistry. Samples are fused with sodium pyrosulfate to ensure complete dissolution before a quantitative analysis.[6][7]
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