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Sodium pyrosulfate

Sodium pyrosulfate
Sodium pyrosulfate.png
Names
IUPAC name
Disodium disulfate
Other names
Sodium pyrosulphate; Disulfuric acid disodium salt.
Identifiers
3D model (JSmol)
ECHA InfoCard 100.034.190
Properties
Na2S2O7
Molar mass 222.12 g/mol
Appearance Translucent white crystals
Density 2.658 g/cm3
Melting point 400.9 °C (753.6 °F; 674.0 K)
Boiling point decomposes at 460 °C (860 °F; 733 K)
Soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Sodium pyrosulfate, or Disodium disulfate, is an inorganic compound with the chemical formula is Na2S2O7.

Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:

Temperatures above 460 °C further decompose the compound, producing sodium sulfate and sulfur trioxide:

Sodium pyrosulfate is used in analytical chemistry; samples are fused with sodium pyrosulfate to ensure complete dissolution prior to a quantitative analysis.



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