HPO42PO43
HPO42PO43 is not a single chemical but a shorthand reference to two related phosphate anions that occur in aqueous solution: hydrogen phosphate (HPO4^2−) and phosphate (PO4^3−). These species arise from the stepwise deprotonation of phosphoric acid (H3PO4) and are part of the phosphate buffer system that dominates phosphate chemistry in water and biological contexts.
Structure and relationship: In both HPO4^2− and PO4^3−, phosphorus is tetrahedrally coordinated to four oxygen atoms.
In solution, the relative abundance of HPO4^2− and PO4^3− is governed by pH. Around physiological pH (approximately
Occurrence and roles: Phosphate species are central to biology and environmental chemistry. They participate in energy
Notes: The notation HPO42PO43 is informal; correct chemistry uses HPO4^2− and PO4^3− with their respective charges.