Holmium(III) nitrate

Holmium(III) nitrate

Names
Other names Holmium trinitrate, Holmium nitrate
Identifiers
CAS Number	anhydrous: 10168-82-8 pentahydrate: 14483-18-2 hexahydrate: 35725-31-6
3D model (JSmol)	Interactive image pentahydrate: Interactive image hexahydrate: Interactive image
ChemSpider	anhydrous: 26948008 pentahydrate: 21241428 hexahydrate: 34196
EC Number	233-438-8
PubChem CID	pentahydrate: 25021754 hexahydrate: 37257
CompTox Dashboard (EPA)	pentahydrate: DTXSID80648469 hexahydrate: DTXSID10189254
InChI InChI=1S/Ho.3NO3/c;3*2-1(3)4/q+3;3*-1 Key: WDVGLADRSBQDDY-UHFFFAOYSA-N pentahydrate: InChI=1S/Ho.3NO3.5H2O/c;3*2-1(3)4;;;;;/h;;;;5*1H2/q+3;3*-1;;;;; Key: BJUGWWDCFYEYOA-UHFFFAOYSA-N hexahydrate: InChI=1S/Ho.3NO3.6H2O/c;3*2-1(3)4;;;;;;/h;;;;6*1H2/q+3;3*-1;;;;;; Key: OMTYKYWUMGRKES-UHFFFAOYSA-N
SMILES [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[Ho+3] pentahydrate: [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.O.[Ho+3] hexahydrate: [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O.O.O.O.[Ho+3]
Properties
Chemical formula	Ho(NO3)3
Molar mass	350,95
Appearance	Yellowish crystals
Melting point	754 °C (1,389 °F; 1,027 K)
Solubility in water	Soluble
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H272, H315, H319, H335
GHS precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P370+378, P403+233, P405, P501
Related compounds
Related compounds	Terbium(III) nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Holmium (III) nitrate is an inorganic compound, a salt of holmium and nitric acid with the chemical formula Ho(NO₃)₃.^[1] The compound forms yellowish crystals, dissolves in water, also forms crystalline hydrates.^[2]

Anhydrous salt is obtained by the action of nitrogen dioxide on holmium(III) oxide:

${\displaystyle \mathsf{2}\mathsf{H}{\mathsf{o}}_{\mathsf{2}}{\mathsf{O}}_{\mathsf{3}}\mathsf{+}\mathsf{9}{\mathsf{N}}_{\mathsf{2}}{\mathsf{O}}_{\mathsf{4}}\stackrel{150^{o}C}{\to }\mathsf{4}\mathsf{H}\mathsf{o}\mathsf{(}\mathsf{N}{\mathsf{O}}_{\mathsf{3}}{\mathsf{)}}_{\mathsf{3}}\mathsf{+}\mathsf{6}\mathsf{N}\mathsf{O}}$

Effect of nitrogen dioxide on metallic holmium:

${\displaystyle \mathsf{H}\mathsf{o}\mathsf{+}\mathsf{3}{\mathsf{N}}_{\mathsf{2}}{\mathsf{O}}_{\mathsf{4}}\stackrel{200^{o}C}{\to }\mathsf{H}\mathsf{o}\mathsf{(}\mathsf{N}{\mathsf{O}}_{\mathsf{3}}{\mathsf{)}}_{\mathsf{3}}\mathsf{+}\mathsf{3}\mathsf{N}\mathsf{O}}$

Reaction of holmium hydroxide and nitric acid:

${\displaystyle \mathsf{H}\mathsf{o}\mathsf{(}\mathsf{O}\mathsf{H}{\mathsf{)}}_{\mathsf{3}}\mathsf{+}\mathsf{3}\mathsf{N}\mathsf{H}{\mathsf{O}}_{\mathsf{3}}\stackrel{150^{o}C}{\to }\mathsf{H}\mathsf{o}\mathsf{(}\mathsf{N}{\mathsf{O}}_{\mathsf{3}}{\mathsf{)}}_{\mathsf{3}}\mathsf{+}\mathsf{3}{\mathsf{H}}_{\mathsf{2}}\mathsf{O}}$

Holmium(III) nitrate forms yellowish crystals.

Forms a crystalline hydrate of the composition Ho(NO₃)₃•5H₂O.^[3]

Soluble in water and ethanol.

Hydrated holmitic nitrate thermally decomposes to form HoONO₃ and decomposes to holmium oxide upon subsequent heating.

The compound is used for the production of ceramics and glass.

Also used to produce metallic holmium and as a chemical reagent.

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