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Mathematics 8 Online
OpenStudy (anonymous):

Why H3PO3 has only 2 -OH bonds and not 3? Both of the states have 0 formal charges on each atoms .

OpenStudy (kirbykirby):

I believe one of the bonds involves a double bond of P with O, and a single bond with P and H. But I believe it's in equilibrium with the other molecular state where it has 3 OH bonds in it.

OpenStudy (kirbykirby):

I found more info here, and it shows the tautomerism of the molecule http://en.wikipedia.org/wiki/Phosphorous_acid

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