
Sodium pyrosulfate

Sodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7. It is a colorless salt.
Preparation.
Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:
Temperatures above 460 °C further decompose the compound, producing sodium sulfate and sulfur trioxide:
Applications.
Sodium pyrosulfate was used in analytical chemistry. Samples are fused with sodium pyrosulfate to ensure complete dissolution before a quantitative analysis.