Ammonium Ferric Sulfate
Title: Ammonium Ferric Sulfate
CAS Registry Number: 10138-04-2
Additional Names: Ferric ammonium sulfate
Molecular Formula: FeH4NO8S2
Molecular Weight: 266.01
Percent Composition: Fe 20.99%, H 1.52%, N 5.27%, O 48.12%, S 24.11%
Line Formula: NH4Fe(SO4)2
Literature References: Prepn: Gmelins, Iron (8th ed.) 59, part B, pp 1010-1018 (1932).
 
Derivative Type: Dodecahydrate
Additional Names: Ferric alum; iron alum
Properties: Colorless to pale-violet, transparent, efflorescent, octahedral crystals. Odorless; acid styptic taste. mp ~37°; d 1.71. Very sol in water; practically insol in alcohol; pH of 0.1M aq soln 2.5.
Melting point: mp ~37°
Density: d 1.71
 
Use: As analytical reagent; mordant in dyeing and printing textiles.
Therap-Cat: Astringent, styptic.
Keywords: Astringent.

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