Pertechnetic acid

Pertechnetic acid
Names
	IUPAC name Pertechnetic acid
Identifiers
CAS Number	14332-45-7;
3D model (JSmol)	Interactive image;
ChemSpider	9979749 ;
PubChem CID	11805084;
	InChI InChI=1S/H2O.3O.Tc/h1H2;;;;/q;;;;+1/p-1 Key: UTQISYNNAQMRBN-UHFFFAOYSA-M ;
	SMILES O[Tc](=O)(=O)=O;
Properties
Chemical formula	HO4Tc
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 or aqua regia. The dark red hygroscopic substance is a strong acid, with a pK_a of 0.32, as such it exists almost entirely as the pertechnetate ion in aqueous solution. The red color in solution is thought to be due to the formation of the polyoxometallate Tc₂₀O4−68.

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.

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