Sodium pyrosulfate

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Sodium pyrosulfate[1]
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Names
IUPAC name
Disodium disulfate
Other names
Sodium pyrosulphate; Disulfuric acid disodium salt.
Identifiers
13870-29-6 YesY
ChEMBL ChEMBL111016 N
Jmol 3D model Interactive image
  • [Na+].[Na+].[O-]S(=O)(=O)OS(=O)(=O)[O-]
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
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Sodium pyrosulfate, or Disodium disulfate, is an inorganic compound with the chemical formula is Na2S2O7.[1]

Preparation

Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:[2]

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.[3][4]

See also

References

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