Sodium disulfate
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Sodium disulfate | ||||||||||||||||||
other names |
Sodium pyrosulfate |
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Molecular formula | Na 2 S 2 O 7 | ||||||||||||||||||
Brief description |
colorless, crystalline solid |
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properties | |||||||||||||||||||
Molar mass | 222.16 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
2.66 g cm −3 (at 20 ° C) |
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Melting point |
402 ° C |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Sodium disulfate , also known as sodium pyrosulfate , is the disodium salt of disulfuric acid .
presentation
The chemical compound with the empirical formula Na 2 S 2 O 7 is created when sodium hydrogen sulphate is heated with elimination of water:
Another possibility of synthesis is the treatment of sodium sulfate with sulfur trioxide .
properties
The compound forms colorless, triclinic crystals , which melt at 402 ° C and decompose to sulfur trioxide and sodium sulfate when glowing.
The monosodium salt of disulfuric acid with the empirical formula NaHS 2 O 7 is unknown.
swell
- ^ Sodium pyrosulfate at the Commission de la santé et de la sécurité du travail in Québec .
- ↑ a b R. Blachnik, J. D'Ans, E. Lax, C. Synowietz: Pocket book for chemists and physicists: Volume 3: Elements, inorganic compounds and materials, minerals. Springer, 1998, ISBN 9783540600350 .
- ↑ SB Rasmussen, KM Eriksen, G. Hatem, F. da Silva, K. Ståhl, R. Fehrmann: Conductivity, Thermal Measurements, X-ray Investigations, and Phase Diagram of the Na 2 S 2 O 7 -K 2 S 2 O 7 system. In: The Journal of Physical Chemistry B. 105, 2001, pp. 2747-2752, doi : 10.1021 / jp0039262 .
- ↑ harmonized classification for this substance . A labeling of disodium disulphate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), which was retrieved on July 29, 2019, is reproduced from a self-classification by the distributor . There is not yet a
- ^ A b R. Abegg, F. Auerbach, I. Koppel: Handbook of inorganic chemistry . Verlag S. Hirzel, 1908, 2nd volume, 1st part, p. 272. Full text
- ^ Research in the Chemical Abstracts database of October 16, 2008.