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What is metaphophoric (HPO3)?

Polymeric form of Ortho phosphoric is called meta phosphoric acid, it exist as dimer, trimer and polymer but trimer and Hexamer is more common.
(1) Trimer of phosphoric acid exists as cyclic trimer which contains three P-O-P bonds.

(2) Hexamer of phosphoric acid exist as sodium salt which is called sodium metaphophate or sodium polymetaphosphate and it is commercially  known as "CALGON" and use as water softener.

Related Questions:


What are "pyro" oxy acids?



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