Ammonium iron(III) sulfate Property

Melting point:

39–41℃ [ALD94]

Density 

1.710

solubility 

very soluble in H2O; insoluble in ethanol

form 

Liquid

color 

Clear amber

Water Solubility 

very soluble H2O; insoluble alcohol [MER06]

Stability:

Stable.

CAS DataBase Reference

10138-04-2(CAS DataBase Reference)

EPA Substance Registry System

Monoammonium ferric sulfate (10138-04-2)

Safety

Hazard Codes 

Xi

Risk Statements 

36/38

Safety Statements 

26

RIDADR 

UN 3264 8/PG 3

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H318Causes serious eye damage

Precautionary statements

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P310Immediately call a POISON CENTER or doctor/physician.

Ammonium iron(III) sulfate Chemical Properties,Usage,Production

Synthesis

Dissolve industrial crystalline ferrous sulfate in water. Filtration, adding sulfuric acid to the filtrate, heating to 30-45 ° C, and then adding 25-30 mL of nitric acid for oxidation. The solution gradually turned from tan to light reddish brown. Use potassium ferricyanide solution to check whether the ferrous ions in the solution are completely oxidized. The solution was slowly heated until it was smoking and a thick slurry was formed, and the nitric acid and nitrogen oxides were removed. Add water to dissolve, re-evaporate until a crystalline film appears, add water and filtered hot solution of ammonium sulfate to this saturated solution, and add concentrated sulfuric acid. Cool to 0°C under stirring, and filter and crystallize to obtain pure ferric ammonium sulfate.

Physical Properties

The dodecahydrate is lilac to violet crystal (anhydrous compound is colorless); hydrated crystals lose all water molecules at 230°C; readily dissolves in water; insoluble in alcohol; aqueous solution is acidic.

Uses

Iron(III) ammonium sulfate is a mordant in dyeing and printing of fabrics and textiles. The compound also is an analytical reagent; and is used in medicine.

Preparation

Ferric ammonium sulfate is prepared by mixing an equimolar solution of ferric sulfate, Fe2(SO4)3, and ammonium sulfate, (NH4)2SO4. Hydrated crystals are obtained following evaporation and cooling of the solution.

Chemical Properties

pale violet crystals

Preparation

Ferric ammonium sulfate is prepared by mixing an equimolar solution offerric sulfate, Fe₂(SO₄)3, and ammonium sulfate, (NH₄)2SO4. Hydrated crystals are obtained following evaporation and cooling of the solution.

Flammability and Explosibility

Not classified

Purification Methods

Crystallise it from aqueous ethanol.