Due to francium being very unstable, its salts are only known to a small extent.
[1][2] Francium halides are all soluble in water and are expected to be white solids.
[3] Francium nitrate, sulfate, hydroxide, carbonate, acetate, and oxalate are all soluble in water, while the iodate, picrate, tartrate, chloroplatinate, and silicotungstate are insoluble.
The insoluble compounds are used to extract francium from other radioactive products, such as zirconium, niobium, molybdenum, tin, and antimony, using the method mentioned in the section above.
[4] The relativistic destabilisation of the 6p3/2 spinor may make francium compounds in oxidation states higher than +1 possible, such as [FrVF6]−; but this has not been experimentally confirmed.