Tellurous Acid - Wikipedia

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Appearance move to sidebar hide From Wikipedia, the free encyclopedia Tellurous acid

Names
IUPAC name Tellurous acid
Other names Tellurium dioxide hydrate, tellurium(IV) oxide hydrate
Identifiers
CAS Number	10049-23-7 N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30465 Y
ChemSpider	23310 Y
ECHA InfoCard	100.030.145
PubChem CID	24936
UNII	IVA6SGP6QM N
CompTox Dashboard (EPA)	DTXSID90143339
InChI InChI=1S/H2O3Te/c1-4(2)3/h(H2,1,2,3) YKey: SITVSCPRJNYAGV-UHFFFAOYSA-N Y InChI=1/H2O3Te/c1-4(2)3/h(H2,1,2,3)Key: SITVSCPRJNYAGV-UHFFFAOYAI
SMILES O[Te+]([O-])O
Properties
Chemical formula	H2TeO3
Molar mass	177.616 grams
Appearance	colorless crystals
Density	~ 3 g/cm3
Boiling point	decomposes
Solubility in water	negligible
Acidity (pKa)	pKa1 = 2.48, pKa2 = 7.70 [1]
Conjugate base	Tellurite
Structure
Crystal structure	unknown
Molecular shape	pyramidal at Te
Related compounds
Other anions	Selenous acidSulfurous acid
Other cations	Sodium tellurite
Related compounds	Telluric acid Selenic acid Sulfuric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Chemical compound

Tellurous acid is an inorganic compound with the formula H2TeO3. It is the oxoacid of tellurium(IV).[2] This compound is not well characterized. An alternative way of writing its formula is (HO)2TeO. In principle, tellurous acid would form by treatment of tellurium dioxide with water, that is by hydrolysis. The related conjugate base is well known in the form of several salts such as potassium hydrogen tellurite, KHTeO3.

Properties

[edit]

In contrast to the analogous compound selenous acid, tellurous acid is only metastable. Most tellurite salts contain the TeO2−3 ion. Oxidation of its aqueous solution with hydrogen peroxide gives the tellurate ion. It is usually prepared as an aqueous solution where it acts as a weak acid.[1][3]

H2TeO3 + H2O ⇌ H3O+ + HTeO−3 Ka1 = 2×10−3 HTeO−3 + H2O ⇌ H3O+ + TeO2−3 Ka2 = 1×10−8

References

[edit]

1. ^ a b Catherine E. Housecroft; Alan G. Sharpe (2008). "Chapter 16: The group 16 elements". Inorganic Chemistry (3rd ed.). Pearson. p. 524. ISBN 978-0-13-175553-6.
2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
3. ^ "Ionization Constants for Weak Acids". www.austincc.edu. Archived from the original on 2014-10-20.

v t e Hydrogen compounds

H3AsO3 H3AsO4 HArF HAt HSO3F H[BF4] HBr HBrO HBrO2 HBrO3 HBrO4 HCl HClO HClO2 HClO3 HClO4 HCN HCNO H2CrO4/H2Cr2O7 H2CO3 H2CS3 HF HFO HI HIO HIO2 HIO3 HIO4 HMnO4 H2MnO4 H2MoO4 HNC NaHCO3 HNCO HNO HNO2 HNO3 H2N2O2 HNO5S H3NSO3 H2O H2O2 H2O3 H2O4 H2O5 H3PO2 H3PO3 H3PO4 H4P2O7 H5P3O10 H[AuCl4] H2[PtCl6] H2OsCl6 H2S H2S2 H2Se H2SeO3 H2SeO4 H4SiO4 H2[SiF6] HSCN HNCS H2SO3 H2SO4 H2SO5 H2S2O3 H3O H2S2O6 H2S2O7 H2S2O8 CF3SO3H H2Te H2TeO3 H6TeO6 H4TiO4 H2Po H[Co(CO)4]

v t e Salts and covalent derivatives of the tellurite ion
H2TeO3 He Li2TeO3 Be BxTexOx C N O +F Ne Na2TeO3 Mg Al Si P S Cl Ar K2TeO3 Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag CdTeO3 In Sn Sb +TeO4 I Xe Cs Ba * Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og   * La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb ** Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No

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