| Revision as of 19:06, 9 January 2012 editBeetstra (talk | contribs)Edit filter managers, Administrators172,049 edits Saving copy of the {{chembox}} taken from revid 469885916 of page Telluric_acid for the Chem/Drugbox validation project (updated: 'CASNo'). |
Latest revision as of 10:04, 27 August 2024 edit Dr vulpes (talk | contribs)Administrators36,962 edits →top: WP:WPCHECK Ordinal number found inside <sup> tagsTag: AWB |
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{{Short description|Chemical compound (Te(OH)6)}} |
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}} |
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| verifiedrevid = 444134163 |
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| ImageFile = Telluric acid.svg |
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| verifiedrevid = 470481521 |
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| ImageSize = 150px |
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| ImageName = Telluric acid |
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| ImageFile = Telluric acid.svg |
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| ImageSize = 150px |
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| ImageFile1 = Telluric-acid-3D-balls.png |
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| ImageName = ] of ortho-telluric acid |
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| ImageSize1 = 150px |
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| ImageFile1 = Telluric-acid-3D-balls.png |
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| ImageName1 = Ball-and-stick model of telluric acid |
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| ImageSize1 = 150px |
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| IUPACName = Telluric(VI) acid |
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| ImageName1 = ] of ortho-telluric acid |
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| OtherNames = orthotelluric acid |
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| IUPACName = Hexahydroxidotellurium |
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| Section1 = {{Chembox Identifiers |
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| OtherNames = {{ubl|Orthotelluric acid|Hexahydroxytellurium|Hexahydroxy-λ<sup>6</sup>-tellane|Tellurium hexahydroxide|Tellurium(VI) hydroxide}} |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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|Section1={{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 55517 |
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| ChemSpiderID = 55517 |
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| InChI = 1/H2O4Te/c1-5(2,3)4/h(H2,1,2,3,4) |
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| InChI = 1/H2O4Te/c1-5(2,3)4/h(H2,1,2,3,4) |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = XHGGEBRKUWZHEK-UHFFFAOYSA-N |
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| StdInChIKey = XHGGEBRKUWZHEK-UHFFFAOYSA-N |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = <!-- blanked - oldvalue: 7803-68-1 --> |
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| CASNo = 7803-68-1 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| PubChem = 61609 |
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| RTECS = |
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| UNII = WE1KZR49WU |
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| PubChem = 62686 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = H<sub>6</sub>O<sub>6</sub>Te |
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| Formula = {{chem2|Te(OH)6}} |
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| Te=1|O=6|H=6 |
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| MolarMass = 229.64 g/mol |
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| Appearance = White ] crystals |
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| Appearance = White ] crystals |
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| Density = 3.07 g/cm<sup>3</sup> |
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| Density = 3.07 g/cm<sup>3</sup> |
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| MeltingPt = 136°C (409.15 K) |
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| MeltingPtC = 136 |
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| pKa = 7.5, 11, 14<ref name=P82db>{{cite book|title=Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution|editor-first=D. 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 219}}</ref> |
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| Solubility = 50.1 g/100 ml at 30°C<ref name="hand"> |
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| Solubility = 50.1 g/(100 ml) at 30 °C<ref name=CRC> |
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{{Citation |
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| last = Lide |
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| last = Lide |
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| first = David R. |
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| first = David R. |
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| author-link = |
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| author-link = |
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| last2 = |
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| year = 1998 |
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| title = Handbook of Chemistry and Physics |
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| edition = 87 |
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| publication-place = Boca Raton, Florida |
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| year = 1998 |
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| publisher = CRC Press |
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| title = Handbook of Chemistry and Physics |
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| edition = 87 |
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| isbn = 0-8493-0594-2 |
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| publication-place = Boca Raton, FL |
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| publisher = CRC Press |
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| isbn = 0-8493-0594-2 |
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| pages = 4–88 |
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}}</ref> |
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| pKa = 7.68, 11.0 at 18°C<ref name="hand2"> |
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{{Citation |
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| first = David R. |
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| year = 1998 |
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| title = Handbook of Chemistry and Physics |
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| edition = 87 |
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| volume = |
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| publication-place = Boca Raton, FL |
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| publisher = CRC Press |
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| isbn = 0-8493-0594-2 |
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| pages = 8–45 |
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}}</ref> |
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| ConjugateBase = ] |
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| Section3 = {{Chembox Structure |
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|Section3={{Chembox Structure |
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| MolShape = octahedral |
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| MolShape = octahedral |
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| Dipole = 0 ] |
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| Dipole = 0 ] |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| MainHazards = corrosive |
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| MainHazards = corrosive |
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| Section8 = {{Chembox Related |
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| OtherCations = |
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| OtherAnions = ] <br> ] <br> ] |
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| OtherCpds = ],<br /> ]<br />] |
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| OtherAnions = ]<br>]<br>] |
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| OtherCompounds = ]<br />]<br />] |
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'''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. |
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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. |
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==Preparation== |
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Telluric acid is formed by the ] of ] or ] with a powerful ] such as ], ] or ].<ref name = "Cotton"/> |
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:{{chem2|TeO2 + H2O2 + 2 H2O → Te(OH)6}} |
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Crystallization of telluric acid solutions below 10 °C gives telluric acid tetrahydrate {{chem2|Te(OH)6*4H2O}}.<ref name = "Greenwood"/> |
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It is an oxidising agent, as shown by the ] for the reaction below, although it is kinetically slow in its oxidations.<ref name = "Cotton"/> |
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:{{chem2|Te(OH)6 + 2 H+ + 2 e- ⇌ TeO2 + 4 H2O}}, ''E''<sup><s>o</s></sup> = +1.02 V |
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], by comparison, is +1.36 V and ] is +0.74 V in oxidizing conditions. |
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==Properties and reactions== |
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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 {{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"/> |
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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 |
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| title = Inorganic Chemistry, 3rd Edition |
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| chapter = Chapter 16: The group 16 elements |
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| author1 = Catherine E. Housecroft |
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| author2 = Alan G. Sharpe |
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| publisher = Pearson |
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| year = 2008 |
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| isbn = 978-0-13-175553-6 |
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| page = 526 |
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}}</ref> |
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Strong heating at over 300 °C produces the α crystalline modification of ], α-{{chem2|TeO3}}. |
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<ref name = holleman/> Reaction with ] gives the hexamethyl ester, {{chem2|Te(OCH3)6}}.<ref name = "Greenwood"/> |
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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"/> |
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==Other forms of telluric acid== |
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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"/> |
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==Other tellurium acids== |
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] {{chem2|H2TeO3}}, containing tellurium in its +4 oxidation state, is known but not well characterised. |
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] is an unstable gas that forms ] upon addition to water. |
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==References== |
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{{reflist}} |
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{{Hydrogen compounds}} |
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{{Hydroxides}} |
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{{Authority control}} |
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] |
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] |
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] |
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] |