NH4H2AsO4 crystallizes in the tetragonal I-42d space group. The structure consists of four ammonium molecules inside a H2AsO4 framework. In the H2AsO4 framework, As(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. H(2) is bonded in a linear geometry to two equivalent O(1) atoms. O(1) is bonded in a bent 120 degrees geometry to one As(1) and one H(2) atom.
NH4H2AsO4 crystallizes in the tetragonal I-42d space group. The structure consists of four ammonium molecules inside a H2AsO4 framework. In the H2AsO4 framework, As(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. All As(1)-O(1) bond lengths are 1.72 Å. H(2) is bonded in a linear geometry to two equivalent O(1) atoms. Both H(2)-O(1) bond lengths are 1.21 Å. O(1) is bonded in a bent 120 degrees geometry to one As(1) and one H(2) atom.