Before revision: The tetrahedra may be connected to form closed –P–O– chains, as in Trimetaphosphoric acid (or cyclo-triphosphoric acid), (or , (–P(O)(OH)–O–)3), a cyclic molecule with three acidic hydrogens.
After revision: The tetrahedra may be connected to form closed –P–O– chains, as in Trimetaphosphoric acid (or cyclotriphosphoric acid), (or , (–P(O)(OH)–O–)3), a cyclic molecule with three acidic hydrogens.