Potassium perrhenate

Potassium perrhenate is an inorganic compound with the chemical formula KReO4.

Preparation
Potassium perrhenate can be produced by the neutralization of potassium hydroxide and perrhenic acid.
 * $$\mathrm{KOH + HReO_4 \longrightarrow KReO_4 + H_2O}$$

Properties
Potassium perrhenate is a white solid that is sparingly soluble in water and ethanol. It have a tetragonal crystal system with the space group I41/a (No. 88), and lattice constants a = 567.4 pm and c = 1266.8 pm. It is a strong oxidizer.