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$\begingroup$ BTW, such an acid salt is hard to achieve due to multiple equilibriums between all phosphites and hydrogenphosphite species. The closest we can have is potassium dihydrogenphosphite, $\ce{KH2PO3}$ which forms the addendum, $\ce{KH2PO3.H2(HPO3)}$. $\endgroup$
– Nilay Ghosh
Commented Dec 25, 2022 at 13:29
$\begingroup$ @NilayGhosh I have quite intentionally avoided physical availability of the acid, considering formal aspect. I suspect the author of the task may have made it up to trick the resolvers, catching them on unusual attributes of acids of phosphorus. $\endgroup$
– Poutnik
Commented Dec 25, 2022 at 13:33

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