Pertechnetic acid

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Pertechnetic acid
Pertechnetic acid 3D ball.png
IUPAC name
Pertechnetic acid
3D model (JSmol)
Molar mass 163 g·mol−1
Conjugate base Pertechnetate
Related compounds
Other anions
Permanganic acid
Perrhenic acid
Other cations
Sodium pertechnetate
Related compounds
Perchloric acid
Except where otherwise noted, 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 entirely as the pertechnetate ion in aqueous solution.

Use of strong enough acid solution, for example, concentrated sulfuric acid, can generate the protonated form, which then exists as the octahedral TcO3(OH)(H2O)2 dihydrate complex.[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" (PDF). Dalton Transactions. 39 (37): 8616–8619. doi:10.1039/C0DT00695E. PMID 20730190.