Ammonium iron (III) sulfate
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Ammonium iron (III) sulfate | ||||||||||||||||||
other names |
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Molecular formula |
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Brief description |
colorless solid, often pale purple due to traces of manganese |
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properties | |||||||||||||||||||
Molar mass | |||||||||||||||||||
Physical state |
firmly |
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density |
1.71 g cm −3 |
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Melting point |
39-41 ° C |
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solubility |
very good in water (1240 g l −1 at 25 ° 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 . |
Ammonium iron (III) sulfate , is a salt consisting of iron , ammonium and sulfate ions . It has the formula NH 4 Fe (SO 4 ) 2 .
properties
The ammonium iron (III) sulfate dodecahydrate, which belongs to the group of alums, forms water-soluble, pale purple cubic crystals with a density of 1.71 g / cm 3 and a molar mass of 482.19 g / mol. The melting point is between 39 and 41 ° C. When heated from 230 ° C, it changes into the anhydrous form NH 4 Fe (SO 4 ) 2 with a molar mass of 266.00. In solution , the Berlin blue is formed with potassium hexacyanoferrate (II) , the yellow blood liquor salt .
use
Ammonium iron (III) sulfate dodecahydrate is used as an indicator for titrations according to Volhard . It is also used as a stain in the textile industry and as an astringent in medicine .
Individual evidence
- ↑ a b Entry on ammonium iron (III) sulfate. In: Römpp Online . Georg Thieme Verlag, accessed on June 27, 2014.
- ↑ a b c d data sheet ammonium iron (III) sulfate from AlfaAesar, accessed on February 1, 2012 ( PDF )(JavaScript required) .