polyphosphoric acid

Definitions of polyphosphoric acid
  1. noun
    a series of oxyacids of phosphorus
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    types:
    metaphosphoric acid
    a glassy solid acid ([HPO3]n) often used as a dehydrating agent
    pyrophosphoric acid
    a solid acid formed by reactions of orthophosphoric acid
    type of:
    oxyacid, oxygen acid
    any acid that contains oxygen
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