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			{{Short description|Chemical compound (Te(OH)6)}}
	{{chembox		{{chembox
			| Verifiedfields = changed
	| Watchedfields = changed		| Watchedfields = changed
	| verifiedrevid = 414397326		| verifiedrevid = 470481521
	| ImageFile = Telluric acid.svg		| ImageFile = Telluric acid.svg
	| ImageSize = 150px		| ImageSize = 150px
	| ImageName = Telluric acid		| ImageName = ] of ortho-telluric acid
	| ImageFile1 = Telluric-acid-ball-and-stick.png		| ImageFile1 = Telluric-acid-3D-balls.png
	| ImageSize1 = 150px		| ImageSize1 = 150px
	| ImageName1 = Ball-and-stick model of telluric acid		| ImageName1 = ] of ortho-telluric acid
	| IUPACName = Telluric(VI) acid		| IUPACName = Hexahydroxidotellurium
			| OtherNames = {{ubl|Orthotelluric acid|Hexahydroxytellurium|Hexahydroxy-λ<sup>6</sup>-tellane|Tellurium hexahydroxide|Tellurium(VI) hydroxide}}
	| OtherNames = orthotelluric acid
	| Section1 = {{Chembox Identifiers		|Section1={{Chembox Identifiers
	| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}		| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
	| ChemSpiderID = 55517		| ChemSpiderID = 55517
	| InChI = 1/H2O4Te/c1-5(2,3)4/h(H2,1,2,3,4)		| InChI = 1/H2O4Te/c1-5(2,3)4/h(H2,1,2,3,4)
	| InChIKey = XHGGEBRKUWZHEK-UHFFFAOYAT		| InChIKey = XHGGEBRKUWZHEK-UHFFFAOYAT
			| ChEBI_Ref = {{ebicite|correct|EBI}}
	| ChEBI = 30463		| ChEBI = 30463
	| SMILES = O(O)(O)(O)(O)O		| SMILES = O(O)(O)(O)(O)O
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	| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}		| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
	| StdInChIKey = XHGGEBRKUWZHEK-UHFFFAOYSA-N		| StdInChIKey = XHGGEBRKUWZHEK-UHFFFAOYSA-N
			| CASNo_Ref = {{cascite|correct|CAS}}
	| CASNo = 7803-68-1		| CASNo = 7803-68-1
			| UNII_Ref = {{fdacite|correct|FDA}}
	| PubChem = 61609
	| RTECS =		| UNII = WE1KZR49WU
			| PubChem = 62686
			| RTECS =
	}}		}}
	| Section2 = {{Chembox Properties		|Section2={{Chembox Properties
	| Formula = H<sub>6</sub>O<sub>6</sub>Te		| Formula = {{chem2|Te(OH)6}}
			| Te=1|O=6|H=6
	| MolarMass = 229.64 g/mol
	| Appearance = White ] crystals		| Appearance = White ] crystals
	| Density = 3.07 g/cm<sup>3</sup>		| Density = 3.07 g/cm<sup>3</sup>
	| MeltingPt = 136°C (409.15 K)		| MeltingPtC = 136
			| MeltingPt_notes =
	| BoilingPt =
			| pKa = 7.5, 11, 14<ref name=P82db>{{cite book|title=Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution|editor-first=D.&nbsp;D.|editor-last=Perrin|edition=2nd|series=] Chemical Data|issue=29|publisher=Pergamon|location=Oxford|year=1982|publication-date=1984|orig-date=1969|lccn=82-16524|isbn=0-08-029214-3|at=Entry&nbsp;219}}</ref>
	| Solubility = 50.1 g/100 ml at 30°C<ref name="hand">
			| Solubility = 50.1 g/(100 ml) at 30 °C<ref name=CRC>
	{{Citation		{{Citation
	| last = Lide		| last = Lide
	| first = David R.		| first = David R.
	| author-link =		| author-link =
	| last2 =		| year = 1998
			| title = Handbook of Chemistry and Physics
	| first2 =
			| edition = 87
	| author2-link =
			| volume =
	| publication-date =
	| date =		| series =
			| publication-place = Boca Raton, Florida
	| year = 1998
			| publisher = CRC Press
	| title = Handbook of Chemistry and Physics
	| edition = 87		| id =
			| isbn = 0-8493-0594-2
	| volume =
	| series =		| doi =
			| oclc =
	| publication-place = Boca Raton, FL
	| place =		| pages =
			| url =
	| publisher = CRC Press
	| id =		| accessdate =
	| isbn = 0-8493-0594-2
	| doi =
	| oclc =
	| pages = 4–88
	| url =
	| accessdate =
	}}</ref>
	| pKa = 7.68, 11.0 at 18°C<ref name="hand2">
	{{Citation
	| last = Lide
	| first = David R.
	| author-link =
	| last2 =
	| first2 =
	| author2-link =
	| publication-date =
	| date =
	| year = 1998
	| title = Handbook of Chemistry and Physics
	| edition = 87
	| volume =
	| series =
	| publication-place = Boca Raton, FL
	| place =
	| publisher = CRC Press
	| id =
	| isbn = 0-8493-0594-2
	| doi =
	| oclc =
	| pages = 8–45
	| url =
	| accessdate =
	}}</ref>		}}</ref>
			| ConjugateBase = ]
	}}		}}
	| Section3 = {{Chembox Structure		|Section3={{Chembox Structure
	| MolShape = octahedral		| MolShape = octahedral
	| CrystalStruct =		| CrystalStruct =
	| Dipole = 0 ]		| Dipole = 0 ]
	}}		}}
	| Section7 = {{Chembox Hazards		|Section7={{Chembox Hazards
	| ExternalMSDS =		| ExternalSDS =
	| MainHazards = corrosive		| MainHazards = corrosive
	| RPhrases =		| HPhrases =
	| SPhrases =		| PPhrases =
			| GHS_ref =
	}}
			}}
	| Section8 = {{Chembox Related
			|Section8={{Chembox Related
	| OtherCations =
			| OtherCations =
	| OtherAnions = ] <br> ] <br> ]
	| OtherCpds = ],<br /> ]<br />]		| OtherAnions = ]<br>]<br>]
			| OtherCompounds = ]<br />]<br />]
	}}		}}
	}}		}}
	'''Telluric acid''' is a ] with the ] Te(OH)<sub>6</sub>. It is a white solid made up of octahedral Te(OH)<sub>6</sub> molecules which persist in aqueous solution.<ref name = "Greenwood">{{Greenwood&Earnshaw}}</ref> There are two forms, rhombohedral and monoclinic, and both contain octahedral Te(OH)<sub>6</sub> molecules.<ref name = "Cotton">{{Cotton&Wilkinson6th}}</ref>		'''Telluric acid''', or more accurately ''']telluric acid''', is a ] with the ] {{chem2|Te(OH)6}}, often written as {{chem2|H6TeO6}}. It is a white crystalline solid made up of octahedral {{chem2|Te(OH)6}} molecules which persist in aqueous solution.<ref name = "Greenwood">{{Greenwood&Earnshaw}}</ref> In the solid state, there are two forms, rhombohedral and monoclinic, and both contain octahedral {{chem2|Te(OH)6}} molecules,<ref name = "Cotton">{{Cotton&Wilkinson6th}}</ref> containing one hexavalent ] (Te) atom in the +6 oxidation state, attached to six ] (–OH) groups, thus, it can be called tellurium(VI) hydroxide.
	Telluric acid is a ] which is ], forming ] ]s with ]s and hydrogen tellurate salts with weaker bases or upon hydrolysis of tellurates in water.<ref name = "Cotton"/><ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.</ref>		Telluric acid is a ] which is ], forming ] ]s with ]s and hydrogen tellurate salts with weaker bases or upon hydrolysis of tellurates in water.<ref name = "Cotton"/><ref name=holleman>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. {{ISBN|0-12-352651-5}}.</ref> It is used as tellurium-source in the synthesis of oxidation catalysts.
	==Preparation==		==Preparation==
	Telluric acid is formed by the ] of ] or ] with a powerful oxidising agent such as ], ] or ].<ref name = "Cotton"/>		Telluric acid is formed by the ] of ] or ] with a powerful ] such as ], ] or ].<ref name = "Cotton"/>
	:TeO<sub>2</sub> + H<sub>2</sub>O<sub>2</sub> + 2H<sub>2</sub>O → Te(OH)<sub>6</sub>		:{{chem2|TeO2 + H2O2 + 2 H2O → Te(OH)6}}
	Crystallisation of telluric acid solutions below 10°C gives Te(OH)<sub>6</sub>.4H<sub>2</sub>O.<ref name = "Greenwood"/>		Crystallization of telluric acid solutions below 10&nbsp;°C gives telluric acid tetrahydrate {{chem2|Te(OH)6*4H2O}}.<ref name = "Greenwood"/>
	It is oxidizing, as shown by the ] for the reaction below, although it is kinetically slow in its oxidations.<ref name = "Cotton"/>		It is an oxidising agent, as shown by the ] for the reaction below, although it is kinetically slow in its oxidations.<ref name = "Cotton"/>
	:H<sub>6</sub>TeO<sub>6</sub> + 2H<sup>+</sup> + 2e<sup>&minus;</sup> {{unicode|&#8652;}} TeO<sub>2</sub> + 4H<sub>2</sub>O ''E''<sup><s>o</s></sup> = +1.02 V		:{{chem2|Te(OH)6 + 2 H+ + 2 e- ⇌ TeO2 + 4 H2O}}, ''E''<sup><s>o</s></sup> = +1.02&nbsp;V
	Chlorine, by comparison, is +1.36V and selenious acid is +0.74V in oxidizing conditions.		], by comparison, is +1.36&nbsp;V and ] is +0.74&nbsp;V in oxidizing conditions.
	==Properties and reactions==		==Properties and reactions==
	The anhydrous acid is stable in air at 100°C but above this it dehydrates to form polymetatelluric acid, a white hygroscopic powder (approximate composition (H<sub>2</sub>TeO<sub>4</sub>)<sub>10</sub>), and allotelluric acid, an acid syrup of unknown structure (approximate composition (H<sub>2</sub>TeO<sub>4</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>).<ref name = "Greenwood"/><br />		The anhydrous acid is stable in air at 100&nbsp;°C but above this it dehydrates to form polymetatelluric acid, a white hygroscopic powder (approximate composition {{chem2|(H2TeO4)10}}), and allotelluric acid, an acid syrup of unknown structure (approximate composition {{chem2|3*H2TeO4*4H2O}}).<ref>{{cite journal|doi=10.1107/S0567740879011286|title=Structure of an adduct of orthotelluric acid and urea|journal=Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry|volume=35|issue=12|pages=3039–3041|year=1979|last1=Loub|first1=J.|last2=Haase|first2=W.|last3=Mergehenn|first3=R.|bibcode=1979AcCrB..35.3039L }}</ref><ref name = "Greenwood"/>
	Strong heating at over 300°C produces the α- crystalline modification of ], α-TeO<sub>3</sub>.
	<ref name = "Wiberg&Holleman">''Inorganic Chemistry'',Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5</ref><br />
	Reaction with ] gives the hexamethyl ester, Te(OMe)<sub>6</sub>.<ref name = "Greenwood"/>
			Typical salts of the acid contains the anions {{chem2|−}} and {{chem2|(2−)}}. The presence of the tellurate ion {{chem2|TeO4(2−)}} has been confirmed in the solid state structure of {{chem2|Rb6}}.<ref name="InorgChem">{{cite book
	Telluric acid and its salts mostly contain hexacoordinate ].<ref name = "Cotton"/> This is true even for salts such as magnesium tellurate, MgTeO<sub>4</sub>, which is isostructural with magnesium molybdate and contains TeO<sub>6</sub> octahedra.<ref name = "Cotton"/>
			| title = Inorganic Chemistry, 3rd Edition
			| chapter = Chapter 16: The group 16 elements
			| author1 = Catherine E. Housecroft
			| author2 = Alan G. Sharpe
			| publisher = Pearson
			| year = 2008
			| isbn = 978-0-13-175553-6
			| page = 526
			}}</ref>
			Strong heating at over 300&nbsp;°C produces the α crystalline modification of ], α-{{chem2|TeO3}}.
			<ref name = holleman/> Reaction with ] gives the hexamethyl ester, {{chem2|Te(OCH3)6}}.<ref name = "Greenwood"/>
			Telluric acid and its salts mostly contain hexacoordinate ].<ref name = "Cotton"/> This is true even for salts such as magnesium tellurate, {{chem2|MgTeO4}}, which is isostructural with magnesium molybdate and contains {{chem2|TeO6}} octahedra.<ref name = "Cotton"/>
	==Other forms of telluric acid==		==Other forms of telluric acid==
	Metatelluric acid, H<sub>2</sub>TeO<sub>4</sub>, the tellurium analogue of ], H<sub>2</sub>SO<sub>4</sub>, is unknown. Allotelluric acid of approximate composition H<sub>2</sub>TeO<sub>4</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>4</sub>, is not well characterised and may be a mixture of Te(OH)<sub>6</sub> and (H<sub>2</sub>TeO<sub>4</sub>)<sub>n</sub>.<ref name = "Greenwood"/><br />		Metatelluric acid, {{chem2|H2TeO4}}, the tellurium analogue of ], {{chem2|H2SO4}}, is unknown. Allotelluric acid of approximate composition {{chem2|3*H2TeO4*4H2O}}, is not well characterised and may be a mixture of {{chem2|Te(OH)6}} and {{chem2|(H2TeO4)_{''n''}|}}.<ref name = "Greenwood"/>
	==Other tellurium acids==		==Other tellurium acids==
	], containing tellurium in its +4 oxidation state, (H<sub>2</sub>TeO<sub>3</sub>) is known but not well characterised.		] {{chem2|H2TeO3}}, containing tellurium in its +4 oxidation state, is known but not well characterised.
	] is an unstable gas that forms ] upon addition to water.		] is an unstable gas that forms ] upon addition to water.
	==References==		==References==
	{{reflist}}		{{reflist}}
	==Sources==
	*{{Cotton&Wilkinson6th}}
	*{{RubberBible83rd}}
	{{Hydrogen compounds}}		{{Hydrogen compounds}}
			{{Hydroxides}}
			{{Authority control}}
	]		]
	]		]
	]		]
	]		]
	]
	]
	]
	]
	]