Ammonium iron (II) sulfate

Structural formula
General
Surname	Ammonium iron (II) sulfate
other names	Moroccan salt
Molecular formula	(NH 4 ) 2 Fe (SO 4 ) 2
Brief description	pale bluish green crystals
External identifiers / databases
CAS number 10045-89-3 (anhydrous) 7783-85-9 (as hexahydrate) EC number 233-151-8 ECHA InfoCard 100.030.125 PubChem 71312611 ChemSpider 23246 Wikidata Q373365
properties
Molar mass	284.05 g mol −1 (anhydrous) 392.13 g mol −1 (as hexahydrate)
Physical state	firmly
density	1.86 g cm −3
Melting point	100 ° C (decomposition)
solubility	good in water (269 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
Toxicological data	3250 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium iron (II) sulfate (formerly also Mohr 's salt ) is the sulfate of ammonium and iron , it forms water-soluble, light green monoclinic crystals. It is usually available commercially as ammonium iron (II) sulfate hexahydrate with six molecules of crystal water . It is a double salt from the group of Tutton salts .

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  Moroccan salt

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  Mohr's salt microscopic, crystals in polarized light

use

Due to its lower sensitivity to oxidation compared to iron (II) sulphate and the consequent purer displayability, it is used to adjust potassium permanganate standard solutions.

Individual evidence

1. ↑ ^{a b} Entry on ammonium iron (II) sulfate. In: Römpp Online . Georg Thieme Verlag, accessed on July 15, 2014.
2. ↑ ^{a b c d e} Entry on ammonium iron (II) sulfate in the GESTIS material database of the IFA , accessed on December 19, 2019(JavaScript required) .
3. ↑ ^{a b} Data sheet ammonium iron (II) sulfate (PDF) from Merck , accessed on January 19, 2011.