Trisha Shetty (Editor)

Sodium pyrosulfate

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Formula
  
Na2S2O7

Density
  
2.66 g/cm³

Melting point
  
400.9 °C

Molar mass
  
222.12 g/mol

Boiling point
  
460 °C

Sodium pyrosulfate wwwlookchemcom300w201007413870296jpg

Appearance
  
Translucent white crystals

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

Contents

Preparation

Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:

2 NaHSO4 → Na2S2O7 + H2O

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

Na2S2O7 → Na2SO4 + SO3

Applications

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

References

Sodium pyrosulfate Wikipedia
(Text) CC BY-SA