Chemistry:Sodium pyrosulfate
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| IUPAC name
Disodium disulfate
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| Other names
Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
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| 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) |
| hydrolyses[2] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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Tracking categories (test):
Sodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7.[1] It is a colorless salt.[3] It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.
Preparation
Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate:[4][5]
- 2 NaHSO4 → Na2S2O7 + H2O
Temperatures above 460 °C further decompose the compound, producing sodium sulfate and sulfur trioxide:
- Na2S2O7 → Na2SO4 + SO3
Applications
Sodium pyrosulfate was used in analytical chemistry. Samples are fused with sodium pyrosulfate to ensure complete dissolution before a quantitative analysis.[6][7]
See also
References
- ↑ 1.0 1.1 Olsen, J. C., ed (1934). Van Nostrand's Chemical Annual. London: Chapman and Hall.
- ↑ Heinz K. Hofmeister; John R. Van Wazer (1962). "Hydrolysis of Sodium Pyrosulfate". Inorganic Chemistry (ACS) 1 (4): 811–812. doi:10.1021/ic50004a019.
- ↑ Helmold Plessen (2000). "Sodium Sulfates". Ullmann's Encyclopedia of Industrial Chemistry (Weinheim: Wiley-VCH). doi:10.1002/14356007.a24_355. ISBN 978-3527306732.
- ↑ Noyes, William (1913). A Textbook of Chemistry. New York: Henry Holt and Company. p. 186. https://archive.org/details/textbookofchemis00noyerich. Retrieved 13 January 2016.
- ↑ von Plessen, Helmold (2000). "Sodium Sulfates". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a24_355. ISBN 9783527303854.
- ↑ Nemodruk, Aleksandr; Karalova, Zinaida (1969). Analytical chemistry of boron: Analytical chemistry of the elements. Charlottesville, VA: Ann Arbor-Humphrey Science Publishers. pp. 23 & 193. ISBN 9780250399192. https://books.google.com/books?id=UAYpAAAAYAAJ&q=%22Sodium+pyrosulfate%22+%22used+for%22.
- ↑ Kiely, P. V.; Jackson, M. L. (1965). "Quartz, Feldspar, and Mica Determination for Soils by Sodium Pyrosulfate Fusion". Soil Science Society of America Journal 29 (2): 159–163. doi:10.2136/sssaj1965.03615995002900020015x. Bibcode: 1965SSASJ..29..159K.
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