Pertechnetic acid

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Pertechnetic acid
Pertechnetic acid 3D ball.png
CAS number 14332-45-7
PubChem 11805084
ChemSpider 9979749 YesY
Jmol-3D images Image 1
Molecular formula HO4Tc
Molar mass 163.91 g mol−1
Related compounds
Other anions Permanganic acid
Perrhenic acid
Other cations Sodium pertechnetate
Related compounds Perchloric acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Pertechnetic acid (HTcO4) is a compound of technetium that is produced by reacting technetium(VII) oxide (Tc2O7) with water or strong oxidizing acids, such as nitric acid, concentrated sulfuric acid, aqua regia.[1] The dark red hygroscopic substance is a strong acid, with a pKa of 0.32,[2] as such it exists almost etirely as the pertechnetate ion in aqueous solution.

In concentrated sulfuric acid, Tc(VII)tetraoxidotechnetate (pertechnetate) anion is unstable and undergoes conversion to the octahedral form of technetic(VII) acid TcO3(OH)(H2O)2.[3]

See also[edit]


  1. ^ Schwochau, Klaus (2000). Technetium : Chemistry and radiopharmaceutical applications. Weinheim [u.a.]: Wiley-VCH. p. 127. ISBN 3-527-29496-1. 
  2. ^ Omori, T.; Asahina, K.; Suganuma, H. "Mechanism of the solvent extraction of pertechnetate with tetraphenylarsonium chloride". Journal of Radioanalytical and Nuclear Chemistry Articles 191 (1): 99–104. doi:10.1007/BF02035989. 
  3. ^ Poineau F, Weck PF, German K, Maruk A, Kirakosyan G, Lukens W, Rego DB, Sattelberger AP, Czerwinski KR (2010). "Speciation of heptavalent technetium in sulfuric acid: structural and spectroscopic studies". Dalton Transactions 39 (37): 8616–8619. doi:10.1039/C0DT00695E. PMID 20730190.