You know what it looks like… but what is it called?
TAKE THE QUIZ“pyrophosphoric”
We have one entry that includes the term pyrophosphoric.
pyrophosphoric acid
noun: a crystalline acid H4P2O7 formed when orthophosphoric acid is heated or prepared in the form of salts by heating acid salts of orthophosphoric acid
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Merriam-Webster unabridged