Pertechnetic acid 高锝酸
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. The dark red hygroscopic substance is a strong acid, with a pKa of 0.32, as such it exists almost etirely as the pertechnetate ion in aqueous solution.