Homopiperazinium bis­(dihydrogenarsenate)

The crystal packing in the title compound, C 5 H 14 N 2 2+ ·2H 2 AsO 4 − , involves anion‐to‐anion O—H⋯O hydrogen bonds, resulting in double chains of dihydrogenarsenate tetra­hedra. The double chains are crosslinked by further O—H⋯O bonds to result in a three‐dimensional framework that accommodates the organic cations in large cavities. The cations inter­act with the framework by way of N—H⋯O bonds.