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Question
Write the structure of pyrophosphoric acid.
Solution
\[\ce{H4P2O7}\] is pyrophosphoric acid. Its structure is
\[\begin{array}{cc}
\phantom{.}\ce{O}\phantom{.......}\ce{O}\phantom{.}\\
\phantom{.}||\phantom{........}||\phantom{.}\\
\ce{HO - P - O - P - OH}\\
\phantom{.......}|\phantom{.........}|\phantom{........}\\
\phantom{......}\ce{OH}\phantom{......}\ce{OH}\phantom{.....}
\end{array}\]
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