Difference between revisions of "Sodium pyrosulfate"
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| − | | Density = 2.658 g/cm< | + | | Density = 2.658 g/cm<sup>3</sup> |
| Formula = Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub> | | Formula = Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub> | ||
| HenryConstant = | | HenryConstant = | ||
Revision as of 19:57, 11 May 2016
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This article is a stub. Please help Sciencemadness Wiki by expanding it, adding pictures, and improving existing text.
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| Names | |
|---|---|
| IUPAC name
Disodium disulfate
| |
| Other names
Disulfuric acid disodium salt
Sodium disulfate Sodium pyrosulphate | |
| Identifiers | |
| Jmol-3D images | Image |
| |
| Properties | |
| Na2S2O7 | |
| Molar mass | 222.12 g/mol |
| Appearance | White crystalline solid |
| Density | 2.658 g/cm3 |
| Melting point | 400.9 °C (753.6 °F; 674.0 K) |
| Boiling point | 460 °C (860 °F; 733 K) (decomposition) |
| Thermochemistry | |
| Std enthalpy of
formation (ΔfH |
-1,717.6--1,907 kJ/mol |
| Hazards | |
| Related compounds | |
| Related compounds
|
Sodium bisulfate Sodium metabisulfite |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Sodium pyrosulfate (also known as disodium disulfate) is a sodium salt of disulfuric acid, with the formula Na2S2O7.
Contents
Properties
Chemical
Sodium pyrosulfate decomposes when heated above 460 °C to give sodium sulfate and sulfur trioxide:
- Na2S2O7 → Na2SO4 + SO3
This reaction is a convenient way of obtaining sulfur trioxide, as it does not require complex installations.
Physical
Sodium disulfate is a white salt, soluble in water.
Availability
Sodium pyrosulfate is rarely available from suppliers. Sigmaaldrich used to sell sodium disulfate fused with sodium bisulfate.
Preparation
Sodium pyrosulfate can be easily made by heating sodium bisulfate at temperatures between 200-400 °C:
- 2 NaHSO4 → Na2S2O7 + H2O
However, other authors indicate different temperature decomposition ranges.[1]
Projects
- Make sulfur trioxide
- Make ammonium pyrosulfate
Handling
Safety
Storage
In closed bottles.
Disposal
References
Relevant Sciencemadness threads
Categories:
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- Chemical compounds
- Inorganic compounds
- Sodium compounds
- Pyrosulfates
- Oxidizing agents
