Beryllium Phosphates, Phosphite, and Hypophosphite

Monoberyllium orthophosphate, BeH₄(PO₄)₂, is similar to the corresponding arsenate. Triberyllium orthophosphate, Be₃P₂O₈.6H₂O, is precipitated from beryllium sulphate by disodium phosphate in the presence of acetic acid. Sodium pyrophosphate precipitates beryllium pyrophosphate, Be₂P₂O₇.9H₂O, from solutions of beryllium salts. Colourless crystals of beryllium metaphosphate, Be(PO₃)₂, can be prepared if water is absent.

Ouvrard obtained some double phosphates of beryllium with alkali metals.

Beryllium phosphite (basic), 4BeHPO₃.BeO.7H₂O, and hypophosphite, BeH₄P₂O₄, have been prepared.