Iron (III) nitrate

from Wikipedia, the free encyclopedia
Structural formula
Iron ion 3 Nitration
General
Surname Iron (III) nitrate
Molecular formula Fe (NO 3 ) 3
Brief description

violet to white-gray, dissolvable mass

External identifiers / databases
CAS number
  • 10421-48-4 (anhydrous)
  • 13476-08-9 (hexahydrate)
  • 7782-61-8 (nonahydrate)
EC number 233-899-5
ECHA InfoCard 100.030.805
PubChem 168014
ChemSpider 23584
Wikidata Q407658
properties
Molar mass 241,86 g · mol -1 (anhydrous)
Physical state

firmly

density

1.68 g cm −3 (nonahydrate)

Melting point

47 ° C (nonahydrate)

solubility

very good in water (1500 g l −1 at 20 ° C)

safety instructions
GHS labeling of hazardous substances
03 - Oxidising 07 - Warning

Caution

H and P phrases H: 272-315-319
P: 302 + 352-305 + 351 + 338
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 .

Iron (III) nitrate Fe (NO 3 ) 3 , EC number : 233-899-5, UN number : 1466) is a salt of iron and nitric acid that crystallizes as hexahydrate or nonahydrate .

presentation

It can be produced by converting metallic iron in medium-concentration nitric acid with the formation of nitrous gases :

properties

Iron (III) nitrate (nonahydrate)

Iron (III) nitrate forms, depending on the water content and impurities, almost colorless, gray-white or light purple or light yellow to brownish, somewhat deliquescent crystals. Stronger colors are also caused by decomposition. Aqueous solutions are yellowish-brown in color and react acidic through hydrolysis .

use

Iron (III) nitrate is used for tanning . In the textile industry it is used as a stain for cotton fabrics and for dyeing silk black by depositing iron (III) hydroxide . It has also been used as a corrosion inhibitor for a long time . More recently, it has been used, not always successfully, to reduce the hydrogen sulfide concentration in pressurized sewage pipes. Two principles work here:

  1. toxic hydrogen sulfide is precipitated as iron (III) sulfide .
  2. the reduction of sulphate to sulphide , instead the nitrate is reduced to ammonia.

In addition, the ammonia formed has a neutralizing and buffering effect .

For the production of iron (III) oxide (Fe 2 O 3 ) as a color pigment , iron (III) nitrate is calcined at a little over 500 ° C until it is completely decomposed.

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

Individual evidence

  1. ↑ a b c d e f g Entry for CAS no. 10421-48-4 in the GESTIS substance database of the IFA , accessed on March 29, 2011(JavaScript required) .