Zirconium(IV) hydroxide

Zirconium (IV) hydroxide, often called hydrous zirconia is an ill-defined material or family of materials variously described as ZrO₂·nH₂O and Zr(OH)₄·nH₂O. All are white solids with low solubility in water. These materials are widely employed in the preparation of solid acid catalysts.^[2][3]

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Zirconium(IV) hydroxide

Identifiers
CAS Number	14475-63-9 Y
3D model (JSmol)	Interactive image
ChemSpider	76194 Y
ECHA InfoCard	100.034.959
EC Number	238-472-7
PubChem CID	84465
UNII	T5YIC9E1JX Y
CompTox Dashboard (EPA)	DTXSID5065774
InChI InChI=1S/4H2O.Zr/h4*1H2;/q;;;;+4/p-4 Y Key: HAIMOVORXAUUQK-UHFFFAOYSA-J Y InChI=1/4H2O.Zr/h4*1H2;/q;;;;+4/p-4 Key: HAIMOVORXAUUQK-XBHQNQODAM
SMILES [Zr+4].[OH-].[OH-].[OH-].[OH-]
Properties
Chemical formula	Zr(OH)4
Molar mass	159.253 g/mol
Appearance	white filter cake
Density	3.25 g/cm3, solid
Melting point	550 °C (1,022 °F; 823 K) decomposes
Solubility in water	0.02 g/100 mL (20 °C)
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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These materials are generated by mild base hydrolysis of zirconium halides and nitrates. A typical precursor is zirconium oxychloride.^[2]