Iron(III) nitrate

Violet to pale gray, deliquescent mass

Fixed

1.68 g · cm -3 ( nonahydrate )

47 ° C ( nonahydrate )

Very well in water (1500 g · l-1 at 20 ° C)

Attention

3250 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search is not possible

Iron (III ) nitrate Fe ( NO3 ) 3, EC number: 233-899-5, UN number: 1466 ) is one crystallizing as hexahydrate or nonahydrate salt of iron and nitric acid.

Representation

They can be prepared by reaction of metallic iron in concentrated nitric acid medium with formation of nitrous gases:

Properties

Iron (III ) nitrate forms, depending on the water content and impurities, almost colorless, gray-white or pale purple or pale yellow to brownish, slightly deliquescent crystals. Stronger staining caused by decomposition. Aqueous solutions are yellowish brown and are acidic by hydrolysis.

Use

Iron (III ) nitrate is used for tanning. In the textile industry, it is used as a mordant for cotton fabrics and black dyeing silk by deposition of iron ( III ) hydroxide. Further, it has long been used as a corrosion inhibitor. In recent times, it is not always successful, is used to reduce the hydrogen sulfide concentration in the pressurized sewers. This act two principles:

In addition, the ammonia formed acts neutralizing and buffering.

For the preparation of iron (III ) oxide ( Fe2O3) as a color pigment is iron (III ) nitrate to the complete decomposition at about 500 ° C and annealed.

Iron (III ) nitrate is used as a catalyst and as a starting material for the preparation of catalysts.