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
ECHA InfoCard	100.030.386
EC Number	233-438-8
PubChem CID	pentahydrate: 25021754 hexahydrate: 37257
CompTox Dashboard (EPA)	DTXSID40890649 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 labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, 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:

${\displaystyle {\mathsf {2Ho_{2}O_{3}+9N_{2}O_{4}\ {\xrightarrow {150^{o}C}}\ 4Ho(NO_{3})_{3}+6NO}}}$

Effect of nitrogen dioxide on metallic holmium:

${\displaystyle {\mathsf {Ho+3N_{2}O_{4}\ {\xrightarrow {200^{o}C}}\ Ho(NO_{3})_{3}+3NO}}}$

Reaction of holmium hydroxide and nitric acid:

${\displaystyle {\mathsf {Ho(OH)_{3}+3NHO_{3}\ \xrightarrow {150^{o}C} \ Ho(NO_{3})_{3}+3H_{2}O}}}$

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 HoONO
₃ 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.