Chromium (III) Nitrate

Chromium nitrate
Chromium nitrate
General
Systematic ; name	Chromium (III) Nitrate
Chem. formula	Cr (NO 3 ) 3
Physical properties
condition	solid
Molar mass	238.011 g / mol
Density	1.85 g / cm³
Thermal properties
T. melt.	60.06 ° C
T. decomp.	125 ° C
Chemical properties
Solubility in water	81 g / 100 ml
Classification
Reg. CAS number	13548-38-4
PubChem
Reg. EINECS number
Smiles
Inchi
RTECS
Chebi
UN number
ChemSpider
Security
LD 50	3250 mg / kg

Chromium (III) nitrate is an inorganic substance, a salt of chromium metal and nitric acid with the formula Cr (NO ₃ ) ₃ , an anhydrous crystalline substance of green color, forms several crystalline hydrates, the most stable of which is nonahydrate [Cr (H ₂ O) ₆ ] (NO ₃ ) ₃ • 3H ₂ O.

Content

1 Receiving
2 Physical properties
3 Chemical properties
4 Application
5 Literature

Getting

The interaction of nitric acid with chromium oxide and hydroxide :

{\mathsf {Cr_{2}O_{3}+6HNO_{3}\ {\xrightarrow {\ }}\ 2Cr(NO_{3})_{3}+3H_{2}O}}

{\ displaystyle {\ mathsf {Cr_ {2} O_ {3} + 6HNO_ {3} \ {\ xrightarrow {\}} \ 2Cr (NO_ {3}) _ {3} + 3H_ {2} O}}}

{\mathsf {Cr(OH)_{3}+3HNO_{3}\ {\xrightarrow {\ }}\ Cr(NO_{3})_{3}+3H_{2}O}}

{\ displaystyle {\ mathsf {Cr (OH) _ {3} + 3HNO_ {3} \ {\ xrightarrow {\}} \ Cr (NO_ {3}) _ {3} + 3H_ {2} O}}}

Exchange reactions:

{\mathsf {CrCl_{3}+3NH_{4}NO_{3}\ {\xrightarrow {100^{o}C}}\ Cr(NO_{3})_{3}+3NH_{3}\uparrow +3HCl\uparrow }}

{\ displaystyle {\ mathsf {CrCl_ {3} + 3NH_ {4} NO_ {3} \ {\ xrightarrow {100 ^ {o} C}} \ Cr (NO_ {3}) _ {3} + 3NH_ {3} \ uparrow + 3HCl \ uparrow}}}

Anhydrous chromium (III) nitrate is obtained by drying crystalline hydrate:

{\mathsf {[Cr(H_{2}O)_{6}](NO_{3})_{3}\cdot 3H_{2}O\ {\xrightarrow {100^{o}C}}\ Cr(NO_{3})_{3}+9H_{2}O}}

{\ displaystyle {\ mathsf {[Cr (H_ {2} O) _ {6}] (NO_ {3}) _ {3} \ cdot 3H_ {2} O \ {\ xrightarrow {100 ^ {o} C} } \ Cr (NO_ {3}) _ {3} + 9H_ {2} O}}}

In industry, chromium (III) nitrate is obtained by the reaction of chromium hydroxide with nitric acid .

Physical Properties

Anhydrous chromium (III) nitrate is a green hygroscopic powder that decomposes at 125 ° C. It forms several crystalline hydrates, the most studied of which is the non-hydrate [Cr (H ₂ O) ₆ ] (NO ₃ ) ₃ • 3H ₂ O, which under standard conditions is a crystalline substance of purple or dark violet color. Six water molecules are concentrated around the chromium atom, the other three molecules are located in the crystal lattice.

Nitrate, like its nonanhydrate, is highly soluble in water , as well as ethanol and acetone .

Chemical Properties

When heated above the melting temperature, it decomposes:

{\mathsf {4Cr(NO_{3})_{3}\ {\xrightarrow {125^{o}C}}\ 2Cr_{2}O_{3}+12NO_{2}\uparrow +3O_{2}\uparrow }}

{\ displaystyle {\ mathsf {4Cr (NO_ {3}) _ {3} \ {\ xrightarrow {125 ^ {o} C}} \ 2Cr_ {2} O_ {3} + 12NO_ {2} \ uparrow + 3O_ { 2} \ uparrow}}}

Application

Used as a mordant for dyeing fabrics in the textile industry;
Used as a catalyst component to produce alkali metals;
Used to obtain various complexes of chromium (III).

Literature

Tretyakov Yu. D. et al. Inorganic chemistry. Chemistry of the elements. Volume 1. - 2nd ed., Rev. - M .: Publishing house of Moscow University, 2007. - 333 p.

Chromium nitrate

General
Systematic name	Chromium (III) Nitrate
Chem. formula	Cr (NO ₃ ) ₃
Physical properties
condition	solid
Molar mass	238.011 g / mol
Density	1.85 g / cm³
Thermal properties
T. melt.	60.06 ° C
T. decomp.	125 ° C
Chemical properties
Solubility in water	81 g / 100 ml
Classification
Reg. CAS number	13548-38-4
PubChem
Reg. EINECS number
Smiles
Inchi
RTECS
Chebi
UN number
ChemSpider
Security
LD ₅₀	3250 mg / kg