Tin (II) sulfate
Crystal structure | |||||||||||||||||||
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__ Sn 2+ __ S 6+ __ O 2− | |||||||||||||||||||
Crystal system |
orthorhombic |
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Space group |
Pnma (No. 62) |
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Lattice parameters |
a = 8.80 Å , b = 5.32 Å, c = 7.12 Å |
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General | |||||||||||||||||||
Surname | Tin (II) sulfate | ||||||||||||||||||
other names |
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Ratio formula | SnSO 4 | ||||||||||||||||||
Brief description |
colorless and odorless solid |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 214.77 g mol −1 | ||||||||||||||||||
Physical state |
firmly |
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density |
4.15 g cm −3 |
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Melting point |
378 ° C (decomposition) |
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solubility |
good in water (330 g l −1 at 25 ° C) |
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safety instructions | |||||||||||||||||||
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Toxicological data | |||||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Tin (II) sulfate is a chemical compound made from tin , sulfur and oxygen with the empirical formula SnSO 4 .
Extraction and presentation
Tin (II) sulfate can be obtained by converting copper (II) sulfate with amalgamated tin.
It can also be made by reacting tin or tin (II) oxide with sulfuric acid.
properties
Tin (II) sulphate is a colorless, non-flammable, easily soluble in water solid. It is stable up to around 360 ° C and then breaks down into sulfur dioxide and tin (IV) oxide . Its aqueous solution reacts strongly acidic and soon decomposes with the precipitation of a basic sulfate. It oxidizes very quickly in air. The compound crystallizes in the orthorhombic space group Pnma (space group no. 62) in a strongly distorted barium sulfate structure. The lattice constants are a = 8.80 Å , b = 5.32 Å and c = 7.12 Å.
use
In the building materials industry, tin sulfate is used as an additive to reduce the chromate content in cement . It is also used as an electrolyte in electroplating and as an additive for electrolytes in lead-acid batteries .
safety instructions
In 2013, tin (II) sulfate was included in the EU's ongoing action plan ( CoRAP ) in accordance with Regulation (EC) No. 1907/2006 (REACH) as part of substance evaluation . The effects of the substance on human health and the environment are re-evaluated and, if necessary, follow-up measures are initiated. The reasons for the uptake of tin (II) sulphate were concerns about consumer use and high (aggregated) tonnage as well as the dangers arising from a possible assignment to the group of CMR substances and the suspected dangers due to sensitizing properties. The re-evaluation has been running since 2016 and is carried out by France . In order to be able to reach a final assessment, further information was requested.
See also
- Tin (IV) sulfate Sn (SO 4 ) 2
Individual evidence
- ↑ a b Data sheet tin (II) sulfate (PDF) from Merck , accessed on January 19, 2011.
- ↑ a b c d e f Entry on tin (II) sulfate in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 966.
- ↑ Production of tin (II) sulphate in powder form
- ↑ Yuntinic: Zinn (II) sulfate ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ JD Donaldson, DC Puxley: The Crystal Structure of Tin (II) Sulphate . In: Acta Crystallographica Section B . tape 28 , no. 3 , March 1972, p. 864-867 , doi : 10.1107 / S0567740872003322 .
- ↑ mig-mbh.de: ZINN - II - SULFAT as a selective CHROMATRDUZIER and its CHEMIE ( Memento of October 7, 2007 in the Internet Archive ).
- ↑ DGUV: Determination of the chromium (VI) content in cements (PDF; 123 kB).
- ^ TU-Clausthal: Script structure of batteries and cells (PDF; 504 kB).
- ↑ Community rolling action plan ( CoRAP ) of the European Chemicals Agency (ECHA): Tin sulphate , accessed on March 26, 2019.