Perselenic Acid

Electrolysis of a cold concentrated solution of potassium selenate containing some free selenic acid has been found to produce a similar effect to that observed with the corresponding sulphate. A potassium perselenate was formed at the anode, the chemical process probably being of the same nature as in the formation of perdisulphate, but on account of its instability the product was not obtainable in a higher degree of purity than approximately 75 per cent.

According to Worsley and Baker the compounds described by them as selenium trioxide and chloroselenic acid (q.v.) both react with hydrogen peroxide to produce a perselenic acid.