Sodium pyrosulfate

Updated on Nov 26, 2024

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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

Appearance Translucent white crystals

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

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

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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